Exam 1 Practice Flashcards

1
Q

What is the atomic number of an atom that has 6 protons, 6 neutrons, and 6 electrons?

12

18

1

0

6

A

6

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2
Q

Which of these refers to atoms with the same atomic number but different atomic masses?

These atoms have different numbers of protons.

These atoms have different numbers of electrons.

These atoms are different elements.

These atoms are isomers.

These atoms are isotopes.

A

These atoms are isotopes.

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3
Q

Fluorine’s atomic number is 9 and its atomic mass is 19. How many neutrons does fluorine have?

81

28

10

19

9

A

10

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4
Q

An uncharged atom of boron has an atomic number of 5 and an atomic mass of 11. How many protons does boron have?

0

5

6

16

11

A

5

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5
Q

Each element is unique and different from other elements because of the number of protons in the nuclei of its atoms. Which of the following indicates the number of protons in an atom’s nucleus?

atomic mass

atomic number

atomic weight

mass weight

mass number

A

atomic number

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6
Q

The innermost electron shell of an atom can hold up to _____ electrons.

18

8

1

32

2

A

2

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7
Q

Which of these relationships is true of an uncharged atom?

The number of neutrons is equal to the number of protons.

The atomic mass is equal to the number of electrons.

The atomic mass is equal to the atomic number.

The number of protons is equal to the number of electrons.

The number of electrons is equal to the number of neutrons.

A

The number of protons is equal to the number of electrons.

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8
Q

What determines the types of chemical reactions that an atom participates in?

its atomic mass

the number of electrons in the outermost electron shell

its atomic number

the number of protons it contains

the number of electrons in the innermost electron shell

A

the number of electrons in the outermost electron shell

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9
Q

What is the difference between starch and cellulose?

A

Starch is made of alpha glucose monomers. All oxygen bonds are down, which makes it curve. Used for energy STORAGE. Cellulose is made of beta glucose monomers. Oxygen bonds alternate, making it straight. Used for STRUCTURE.

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10
Q

A(n) _____ refers to two or more atoms held together by covalent bonds. molecule shell isotope ion community

A

Molecule

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11
Q

Atoms with the same number of protons but with different electrical charges _____. are different ions have different numbers of neutrons have different atomic masses have different atomic numbers are different isotopes

A

are different ions

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12
Q

In salt, what is the nature of the bond between sodium and chlorine?

hydrogen

ionic

hydrophobic

nonpolar

covalent

polar covalent

A

Ionic

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13
Q

What is the result of the animated process? a positively charged sodium ion and a negatively charged chlorine ion a negatively charged sodium ion and a negatively charged chlorine ion a positively charged sodium ion and a positively charged chlorine ion covalent bond formation a negatively charged sodium ion and a positively charged chlorine ion

A

a positively charged sodium ion and a negatively charged chlorine ion

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14
Q

An ionic bond involves _____. an attraction between ions of opposite charge the unequal sharing of an electron pair the sharing of a single pair of electrons water avoidance no atoms other than sodium and chlorine

A

an attraction between ions of opposite charge

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15
Q

Please refer to the figure to answer the following question.

Which drawing depicts the electron configuration of neon ( 2010Ne)?

A B C D E

A

E

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16
Q

What type of bond is joining the two hydrogen atoms?

hydrophilic ionic hydrophobic covalent hydrogen

A

Covalent

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17
Q

Many mammals control their body temperature by sweating. Which property of water is most directly responsible for the ability of sweat to lower body temperature?

the release of heat by the formation of hydrogen bonds

water’s change in density when it condenses

water’s high surface tension

the absorption of heat by the breaking of hydrogen bonds

water’s ability to dissolve molecules in the air

A

the absorption of heat by the breaking of hydrogen bonds

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18
Q

Water is able to form hydrogen bonds because

oxygen has a valence of 2.

each of the hydrogen atoms in a water molecule is weakly negative in charge.

the water molecule is shaped like a tetrahedron.

the oxygen atom in a water molecule has a weak positive charge.

the bonds that hold together the atoms in a water molecule are polar covalent bonds.

A

the bonds that hold together the atoms in a water molecule are polar covalent bonds.

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19
Q

Which of the following effects is produced by the high surface tension of water?

Lakes don’t freeze solid in winter, despite low temperatures.

Organisms resist temperature changes, although they give off heat due to chemical reactions.

A water strider can walk across the surface of a small pond.

The pH of water remains exactly neutral.

Water can act as a solvent.

A

A water strider can walk across the surface of a small pond.

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20
Q

Water’s high specific heat is mainly a consequence of the

absorption and release of heat when hydrogen bonds break and form.

high specific heat of oxygen and hydrogen atoms.

inability of water to dissipate heat into dry air.

fact that water is a poor heat conductor.

small size of the water molecules.

A

absorption and release of heat when hydrogen bonds break and form

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21
Q

Which type of bond must be broken for water to vaporize?

ionic bonds

hydrogen bonds

polar covalent bonds

nonpolar covalent bonds

covalent bonds

A

hydrogen bonds

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22
Q

Why does ice float in liquid water?

The liquid water molecules have more kinetic energy and thus support the ice. Ice always has air bubbles that keep it afloat.

The crystalline lattice of ice causes it to be denser than liquid water.

The ionic bonds between the molecules in ice prevent the ice from sinking.

Hydrogen bonds stabilize and keep the molecules of ice farther apart than the water molecules of liquid water.

A

Hydrogen bonds stabilize and keep the molecules of ice farther apart than the water molecules of liquid water.

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23
Q

What is the pH of a solution with a hydrogen ion [H+] concentration of 10-8 M?

pH 8

pH 6

pH 4

pH 2

pH 10

A

pH 8

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24
Q

If the pH of a solution is decreased from 9 to 8, it means that the

concentration of OH- has increased 10-fold (10X) compared to what it was at pH 9; concentration of H+ remains unchanged.

concentration of H+ has decreased to one-tenth (1/10) what it was at pH 9; concentration of OH-remains unchanged.

concentration of H+ has increased 10-fold (10X) compared to what it was at pH 9; concentration of OH- remains unchanged.

concentration of OH- has decreased to one-tenth (1/10) what it was at pH 9; concentration of H+remains unchanged.

concentration of H+ has increased 10-fold (10X) compared to what it was at pH 9 and concentration of OH– has decreased to one-tenth (1/10) what it was at pH 9.

A

concentration of H+ has increased 10-fold (10X) compared to what it was at pH 9 and concentration of OH has decreased to one-tenth (1/10) what it was at pH 9.

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25
The bonds that are broken when water vaporizes are ionic bonds. polar covalent bonds. covalent bonds between atoms within water molecules. hydrogen bonds between water molecules. nonpolar covalent bonds
hydrogen bonds between water molecules.
26
How many electron pairs does carbon share in order to complete its valence shell? 1 4 3 8 2
4
27
Which of the following is not a polymer? glucose starch cellulose chitin DNA
Glucose
28
What is the chemical mechanism by which cells make polymers from monomers? hydrolysis dehydration reactions the formation of disulfide bridges between monomers ionic bonding of monomers phosphodiester linkages
Dehydration reactions
29
Glycogen is \_\_\_\_\_. a transport protein that carries oxygen a polysaccharide found in animals a polysaccharide found in plant cell walls the form in which plants store sugars a source of saturated fat
a polysaccharide found in animals
30
glucose + glucose —\> _____ by \_\_\_\_\_. sucrose + water ... dehydration synthesis starch + water ... dehydration synthesis maltose + water ... dehydration synthesis lactose + water ... hydrolysis cellulose + water ... hydrolysis
maltose + water ... dehydration synthesis
31
Which of these is a source of lactose? sugar beets potatoes milk starch sugar cane
Milk
32
Which of these is a polysaccharide? glucose sucrose lactose galactose cellulose
Cellulose
33
\_\_\_\_\_ is the most abundant organic compound on Earth. Glycogen Lactose Starch Cellulose Glucose
Cellulose
34
Which of the following is *true* of both starch and cellulose? They are both used for energy storage in plants. They can both be digested by humans. They are both structural components of the plant cell wall. They are geometric isomers of each other. They are both polymers of glucose.
They are both polymers of glucose.
35
Which of the following is *true* of cellulose? It is a storage polysaccharide for energy in animal cells. It is a polymer composed of sucrose monomers. It is a major structural component of plant cell walls. It is a major structural component of animal cell plasma membranes. It is a storage polysaccharide for energy in plant cells.
It is a major structural component of plant cell walls.
36
Which of these is NOT a lipid? cholesterol phospholipid wax RNA steroids
RNA
37
This figure is an example of a(n) \_\_\_\_\_. ![]() protein unsaturated fat nucleic acid steroid saturated fat
Saturated Fat
38
Which of these is a phospholipid? ![Question #5, Answer #3](http://session.masteringbiology.com/problemAsset/1100498/3/0509a3.jpg) ![Question #5, Answer #2](http://session.masteringbiology.com/problemAsset/1100498/3/0509a2.jpg) ![Question #5, Answer #5](http://session.masteringbiology.com/problemAsset/1100498/3/0509a5.jpg) ![Question #5, Answer #4](http://session.masteringbiology.com/problemAsset/1100498/3/0509a4.jpg) ![Question #5, Answer #1](http://session.masteringbiology.com/problemAsset/1100498/3/0509a1.jpg)
![Question #5, Answer #5](http://session.masteringbiology.com/problemAsset/1100498/3/0509a5.jpg)
39
Which of these is rich in unsaturated fats? olive oil butter beef fat a fat that is solid at room temperature lard
Olive Oil
40
A function of cholesterol that does not harm health is its role \_\_\_\_\_. the most abundant male sex hormone as the primary female sex hormone as a component of animal cell membranes All of cholesterol's effects cause the body harm. in calcium and phosphate metabolism
as a component of animal cell membranes
41
![]() The molecule shown in the figure is a polypeptide. unsaturated fatty acid. saturated fatty acid. triacylglycerol. polysaccharide.
unsaturated fatty acid.
42
Proteins are polymers of \_\_\_\_\_. amino acids nucleotides CH2O units glycerol hydrocarbons
amino acids
43
What type of bond joins the monomers in a protein's primary structure? S - S hydrophobic peptide hydrogen ionic
peptide
44
Which of these illustrates the secondary structure of a protein? ![Question #19, Answer #3](http://session.masteringbiology.com/problemAsset/1100500/4/0519a3.jpg) ![Question #19, Answer #5](http://session.masteringbiology.com/problemAsset/1100500/4/0519a5.jpg) ![Question #19, Answer #1](http://session.masteringbiology.com/problemAsset/1100500/4/0519a1.jpg) ![Question #19, Answer #4](http://session.masteringbiology.com/problemAsset/1100500/4/0519a4.jpg) ![Question #19, Answer #2](http://session.masteringbiology.com/problemAsset/1100500/4/0519a2.jpg)
![Question #19, Answer #5](http://session.masteringbiology.com/problemAsset/1100500/4/0519a5.jpg)
45
The secondary structure of a protein results from \_\_\_\_\_. hydrogen bonds peptide bonds hydrophobic interactions ionic bonds bonds between sulfur atoms
hydrogen bonds
46
Tertiary structure is NOT directly dependent on \_\_\_\_\_. bonds between sulfur atoms ionic bonds peptide bonds hydrogen bonds hydrophobic interactions
peptide bonds
47
The bonding of two amino acid molecules to form a larger molecule requires both the release of a carbon dioxide molecule and the addition of a nitrogen atom. the addition of a water molecule. the release of a carbon dioxide molecule. the addition of a nitrogen atom. the release of a water molecule.
the release of a water molecule.
48
There are 20 different amino acids. What makes one amino acid different from another? different amino groups attached to an alpha (α) carbon different carboxyl groups attached to an alpha (α) carbon different side chains (R groups) attached to an alpha (α) carbon different alpha (α) carbons different asymmetric carbons
different side chains (R groups) attached to an alpha (α) carbon
49
Which type of interaction stabilizes the alpha (α) helix and the beta (β) pleated sheet structures of proteins? hydrogen bonds ionic bonds hydrophobic interactions peptide bonds nonpolar covalent bonds
hydrogen bonds
50
![]() The structure depicted in the figure shows the 1-4 linkage of the β glucose monomers of cellulose. β pleated sheet secondary structure of a polypeptide. 1-4 linkage of the α glucose monomers of starch. α helix secondary structure of a polypeptide. double helical structure of a DNA molecule.
α helix secondary structure of a polypeptide
51
Which of the following descriptions *best* fits the class of molecules known as nucleotides? a nitrogenous base and a pentose sugar a nitrogenous base, a phosphate group, and a pentose sugar a pentose sugar and a purine or pyrimidine a nitrogenous base and a phosphate group a phosphate group and an adenine or uracil
a nitrogenous base, a phosphate group, and a pentose sugar
52
Which of the following statements *best* summarizes the structural differences between DNA and RNA? DNA nucleotides contain a different sugar than RNA nucleotides. RNA is a protein, whereas DNA is a nucleic acid. RNA is a protein, whereas DNA is a nucleic acid; and RNA is a double helix, but DNA is single-stranded. RNA is a double helix, but DNA is single-stranded . DNA is a protein, whereas RNA is a nucleic acid.
DNA nucleotides contain a different sugar than RNA nucleotides.
53
he structure of a chloroplast is closely tied to its function as the site of photosynthesis. ![]() Some of the following statements are true for chloroplasts; others are true for mitochondria. Which statements are true for chloroplasts? Select the *three* that apply. They contain the green pigment chlorophyll. They are the sites of reactions that convert solar energy into chemical energy. Their matrix contains enzymes that function in cellular respiration. Their inner membrane has infoldings called cristae. They have membranous sacs called thylakoids that are surrounded by a fluid called stroma. They are the sites of reactions that convert chemical energy to ATP.
They contain the green pigment chlorophyll. They are the sites of reactions that convert solar energy into chemical energy They have membranous sacs called thylakoids that are surrounded by a fluid called stroma.
54
Which type of organelle is primarily involved in the synthesis of oils, phospholipids, and steroids? smooth endoplasmic reticulum mitochondrion lysosome ribosome contractile vacuole
smooth endoplasmic reticulum
55
Which structure is the site of the synthesis of proteins that may be exported from the cell? rough ER plasmodesmata tight junctions Golgi vesicles lysosomes
rough ER
56
Which of the following is a compartment that often takes up much of the volume of a plant cell? Golgi apparatus peroxisome mitochondrion lysosome vacuole
vacuole
57
Organelles other than the nucleus that contain DNA include chloroplasts. mitochondria. ribosomes. mitochondria and chloroplasts only ribosomes, mitochondria, and chloroplasts
mitochondria and chloroplasts only
58
Which of the following are capable of converting light energy to chemical energy? Golgi bodies mitochondria chloroplasts peroxisomes leucoplasts
chloroplasts
59
Why isn't the mitochondrion classified as part of the endomembrane system? It has too many vesicles. It is not attached to the outer nuclear envelope. Its structure is not derived from the ER. It only has two membrane layers. It is not involved in protein synthesis.
Its structure is not derived from the ER.
60
Which of the following is present in a prokaryotic cell? mitochondrion ER nuclear envelope ribosome chloroplast
ribosome
61
Which statement *correctly* characterizes bound ribosomes? The most common location for bound ribosomes is the cytoplasmic surface of the plasma membrane. Bound ribosomes are enclosed in their own membrane. Bound ribosomes generally synthesize membrane proteins and secretory proteins. Bound and free ribosomes are structurally different. All of the above.
Bound ribosomes generally synthesize membrane proteins and secretory proteins.
62
Cells of the pancreas will incorporate radioactively labeled amino acids into proteins. This "tagging" of newly synthesized proteins enables a researcher to track their location. In this case, we are tracking an enzyme secreted by pancreatic cells. What is its most likely pathway? nucleus→ER→Golgi ER→Golgi→vesicles that fuse with plasma membrane ER→lysosomes→vesicles that fuse with plasma membrane Golgi→ER→lysosome ER→Golgi→nucleus
ER→Golgi→vesicles that fuse with plasma membrane
63
Which structure is common to plant *and* animal cells? centriole wall made of cellulose mitochondrion central vacuole chloroplast
mitochondrion
64
Which structure-function pair is *mismatched*? Golgi; protein trafficking nucleolus; production of ribosomal subunits microtubule; muscle contraction ribosome; protein synthesis lysosome; intracellular digestion
microtubule; muscle contraction
65
The cilia and flagella of eukaryotic cells are composed of \_\_\_\_\_. intermediate filaments tonofilaments microtubules pili microfilaments
microtubules
66
Cells can be described as having a cytoskeleton of internal structures that contribute to the shape, organization, and movement of the cell. Which of the following are part of the cytoskeleton? lysosomes nucleoli mitochondria the nuclear envelope microfilaments
microfilaments
67
Which of the following types of molecules are the major structural components of the cell membrane? glycoproteins and cholesterol phospholipids and cellulose phospholipids and proteins nucleic acids and proteins proteins and cellulose
phospholipids and proteins
68
*For the following question, match the labeled component of the cell membrane (see the figure) with its description.* ![](http://session.masteringbiology.com/problemAsset/1089055/5/fig0701.jpg) peripheral protein A B C D E
D
69
*For the following question, match the labeled component of the cell membrane (see the figure) with its description.* ![](http://session.masteringbiology.com/problemAsset/1089056/5/fig0701.jpg) cholesterol A B C D E
E
70
*For the following question, match the labeled component of the cell membrane (see the figure) with its description.* ![](http://session.masteringbiology.com/problemAsset/1089057/5/fig0701.jpg) fiber of the extracellular matrix A B C D E
A
71
*For the following question, match the labeled component of the cell membrane (see the figure) with its description.* ![](http://session.masteringbiology.com/problemAsset/1089058/5/fig0701.jpg) microfilament of the cytoskeleton A B C D E
C
72
According to the fluid mosaic model of cell membranes, which of the following is a *true* statement about membrane phospholipids? They are free to depart from the membrane and dissolve in the surrounding solution. They frequently flip-flop from one side of the membrane to the other. They occur in an uninterrupted bilayer, with membrane proteins restricted to the surface of the membrane. They have hydrophilic tails in the interior of the membrane. They can move laterally along the plane of the membrane.
They can move laterally along the plane of the membrane
73
What kinds of molecules pass through a cell membrane most easily? ionic large and hydrophobic small and hydrophobic large polar monosaccharides such as glucose
small and hydrophobic
74
Which of the following is a characteristic feature of a carrier protein in a plasma membrane? It requires the expenditure of cellular energy to function. It has few, if any, hydrophobic amino acids. It works against diffusion. It is a peripheral membrane protein. It exhibits a specificity for a particular type of molecule.
It exhibits a specificity for a particular type of molecule.
75
When a plant cell, such as one from a peony stem, is submerged in a very hypotonic solution, what is likely to occur? the cell will become flaccid the cell will become turgid plasmolysis will shrink the interior the cell membrane will lyse the cell will burst
the cell will become turgid
76
According to the fluid mosaic model of membrane structure, proteins of the membrane are mostly embedded in a lipid bilayer. randomly oriented in the membrane, with no fixed inside-outside polarity. spread in a continuous layer over the inner and outer surfaces of the membrane. free to depart from the fluid membrane and dissolve in the surrounding solution. confined to the hydrophobic core of the membrane.
embedded in a lipid bilayer.
77
![]() Based on the figure above, which of these experimental treatments would increase the rate of sucrose transport into the cell? adding a substance that makes the membrane more permeable to hydrogen ions decreasing extracellular sucrose concentration decreasing extracellular pH decreasing cytoplasmic pH adding an inhibitor that blocks the regeneration of ATP
decreasing extracellular pH
78
When chemical, transport, or mechanical work is done by an organism, what happens to the heat generated? It is transported to specific organs such as the brain. It is used to store energy as more ATP. It is lost to the environment. It is used to power yet more cellular work. It is used to generate ADP from nucleotide precursors.
It is lost to the environment.
79
In general, enzymes are what kinds of molecules? minerals carbohydrates nucleic acids proteins lipids
proteins
80
Enzymes work by \_\_\_\_\_.
reducing EA
81
An enzyme \_\_\_\_\_. is an organic catalyst is a inorganic catalyst is a source of energy for endergonic reactions can bind to nearly any molecule increases the EA of a reaction
is an organic catalyst
82
What name is given to the reactants in an enzymatically catalyzed reaction? active sites substrate reactors EA products
substrate
83
As a result of its involvement in a reaction, an enzyme \_\_\_\_\_. is unchanged is used up loses energy permanently alters its shape. loses a phosphate group
is unchanged
84
What is the correct label for "A"? ![]() substrate energy ATP energy of activation uphill enzyme energy
energy of activation
85
The active site of an enzyme is the region that is inhibited by the presence of a coenzyme or a cofactor. binds the products of the catalytic reaction. binds allosteric regulators of the enzyme. is involved in the catalytic reaction of the enzyme.
is involved in the catalytic reaction of the enzyme.
86
What process occurs in Box A? ![]() glycolysis oxidative phosphorylation electron transport electron transport and oxidative phosphorylation the citric acid cycle
glycolysis
87
What process occurs within Box B? ![]() the citric acid cycle oxidative phosphorylation photophosphorylation electron transport glycolysis
The citric acid cycle
88
What molecule is indicated by the letter D? ![]() ATP oxygen glucose water pyruvate
oxygen
89
Where does glycolysis takes place? mitochondrial intermembrane space cytosol mitochondrial matrix mitochondrial inner membrane mitochondrial outer membrane
cytosol
90
How many NADH are produced by glycolysis? 1 4 5 3 2
2
91
In glycolysis, ATP molecules are produced by \_\_\_\_\_. cellular respiration oxidative phosphorylation photosynthesis photophosphorylation substrate-level phosphorylation
substrate-level phosphorylation
92
Which of these is NOT a product of glycolysis? pyruvate ATP NADH FADH2
FADH2
93
In glycolysis, what starts the process of glucose oxidation? NADPH hexokinase ADP ATP FADH2
ATP
94
In glycolysis there is a net gain of _____ ATP. 2 4 1 5 3
2
95
During glycolysis, when glucose is catabolized to pyruvate, most of the energy of glucose is used to phosphorylate fructose to form fructose-6-phosphate. retained in the pyruvate. stored in the NADH produced. transferred directly to ATP. transferred to ADP, forming ATP.
retained in the pyruvate.
96
Starting with one molecule of glucose, the "net" products of glycolysis are 6 CO2, 6 H2O, 36 ATP, and 2 citrate. 2 NAD+, 2 H+, 2 pyruvate, 2 ATP, and 2 H2O. 2 NADH, 2 H+, 2 pyruvate, 2 ATP, and 2 H2O. 2 FADH2, 2 pyruvate, 4 ATP, and 2 H2O. 6 CO2, 6 H2O, 2 ATP, and 2 pyruvate.
2 NADH, 2 H+, 2 pyruvate, 2 ATP, and 2 H2O.
97
In glycolysis, for each molecule of glucose oxidized to pyruvate 2 molecules of ATP are used and 2 molecules of ATP are produced. 2 molecules of ATP are used and 4 molecules of ATP are produced. 4 molecules of ATP are used and 2 molecules of ATP are produced. 2 molecules of ATP are used and 6 molecules of ATP are produced. 6 molecules of ATP are used and 6 molecules of ATP are produced.
2 molecules of ATP are used and 4 molecules of ATP are produced.
98
During cellular respiration, acetyl CoA accumulates in which location? mitochondrial matrix mitochondrial inner membrane mitochondrial intermembrane space mitochondrial outer membrane cytosol
mitochondrial matrix
99
Energy released by the electron transport chain is used to pump H+ ions into which location? mitochondrial matrix cytosol mitochondrial intermembrane space mitochondrial outer membrane mitochondrial inner membrane
mitochondrial intermembrane space
100
When hydrogen ions are pumped from the mitochondrial matrix across the inner membrane and into the intermembrane space, the result is the restoration of the Na+/K+ balance across the membrane. creation of a proton gradient. formation of ATP. reduction of NAD+. lowering of pH in the mitochondrial matrix.
creation of a proton gradient.
101
Where is ATP synthase located in the mitochondrion? electron transport chain cytosol outer membrane inner membrane mitochondrial matrix
Inner membrane
102
In chemiosmotic phosphorylation, what is the most direct source of energy that is used to convert ADP + Pi to ATP? energy released as electrons flow through the electron transport system No external source of energy is required because the reaction is exergonic. energy released from movement of protons through ATP synthase energy released from ATP synthase pumping hydrogen ions from the mitochondrial matrix energy released from substrate-level phosphorylation
energy released from movement of protons through ATP synthase
103
During oxidative phosphorylation, H2O is formed. Where does the oxygen for the synthesis of the water come from? carbon dioxide (CO2) lactate (C3H5O3-) glucose (C6H12O6) pyruvate (C3H3O3-) molecular oxygen (O2)
molecular oxygen (O2)
104
The primary role of oxygen in cellular respiration is to combine with carbon, forming CO2. catalyze the reactions of glycolysis. act as an acceptor for electrons and hydrogen, forming water. combine with lactate, forming pyruvate. yield energy in the form of ATP as it is passed down the respiratory chain.
act as an acceptor for electrons and hydrogen, forming water.
105
Carbon dioxide (CO2) is released during which of the following stages of cellular respiration? oxidation of pyruvate to acetyl CoA and the citric acid cycle oxidative phosphorylation and fermentation glycolysis and the oxidation of pyruvate to acetyl CoA the citric acid cycle and oxidative phosphorylation fermentation and glycolysis
oxidation of pyruvate to acetyl CoA and the citric acid cycle
106
Where are the proteins of the electron transport chain located? cytosol mitochondrial matrix mitochondrial intermembrane space mitochondrial inner membrane mitochondrial outer membrane
mitochondrial inner membrane
107
Which metabolic pathway is common to both cellular respiration and fermentation? oxidative phosphorylation glycolysis the citric acid cycle the oxidation of pyruvate to acetyl CoA chemiosmosis
glycolysis
108
In the absence of oxygen, yeast cells can obtain energy by fermentation, resulting in the production of ATP, NADH, and pyruvate. ATP, pyruvate, and oxygen. ATP, CO2, and ethanol (ethyl alcohol). ATP, CO2, and lactate. ATP, pyruvate, and acetyl CoA.
ATP, CO2, and ethanol (ethyl alcohol).
109
One function of both alcohol fermentation and lactic acid fermentation is to reduce FAD+ to FADH2. reduce FADH2 to FAD+. oxidize NADH to NAD+. reduce NAD+ to NADH. none of the above
oxidize NADH to NAD+
110
The oxygen consumed during cellular respiration is involved directly in which process or event? the phosphorylation of ADP to form ATP glycolysis the oxidation of pyruvate to acetyl CoA accepting electrons at the end of the electron transport chain the citric acid cycle
accepting electrons at the end of the electron transport chain
111
Which of these equations best summarizes photosynthesis? 6 CO2 + 6 O2 → C6H12O6 + 6 H2O C6H12O6 + 6 O2 → 6 CO2 + 6 H2O + Energy C6H12O6 + 6 O2 → 6 CO2 + 12 H2O H2O → 2 H+ + 1/2 O2 + 2e- 6 CO2 + 6 H2O → C6H12O6 + 6 O2
6 CO2 + 6 H2O → C6H12O6 + 6 O2
112
Where does the Calvin cycle occur? ![Question #5](http://session.masteringbiology.com/problemAsset/1100527/2/1005q.jpg) C B D A E
E
113
The light reactions of photosynthesis use _____ and produce \_\_\_\_\_. carbon dioxide ... oxygen NADPH ... NADP+ water ... NADPH carbon dioxide ... sugar NADPH ... oxygen
water ... NADPH
114
Which of these phosphorylates ADP to make ATP? ![Question #8](http://session.masteringbiology.com/problemAsset/1100529/2/1008q.jpg) D E C A B
E
115
\_\_\_\_\_ releases energy that is used to pump hydrogen ions from the stroma into the thylakoid compartment. ![Question #9](http://session.masteringbiology.com/problemAsset/1100529/2/1009q.jpg) E B D A C
B
116
\_\_\_\_\_ splits water into 1/2 O2, H+, and *e- *. ![Question #10](http://session.masteringbiology.com/problemAsset/1100529/2/1010q.jpg) D A B E C
A
117
Energized electrons from ____ enter an electron transport chain and are then used to reduce NADP+. ![Question #11](http://session.masteringbiology.com/problemAsset/1100529/2/1011q.jpg) B C D E A
C
118
Chlorophyll can be found in \_\_\_\_\_. ![]() B and D B and C A and B A and C B and E
A and C
119
Which of the following statements *best* describes the relationship between photosynthesis and respiration? Photosynthesis stores energy in complex organic molecules, while respiration releases it. Respiration is the reversal of the biochemical pathways of photosynthesis. Respiration is anabolic and photosynthesis is catabolic. Photosynthesis occurs only in plants and respiration occurs only in animals. ATP molecules are produced in photosynthesis and used up in respiration.
Photosynthesis stores energy in complex organic molecules, while respiration releases it.
120
Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle? electrons and H+ CO2 and glucose ATP and NADPH ADP, Pi, and NADP+ H2O and O2
ATP and NADPH
121
In the thylakoid membranes, what is the main role of the antenna pigment molecules? transfer electrons to ferredoxin and then NADPH concentrate photons within the stroma synthesize ATP from ADP and Pi split water and release oxygen to the reaction-center chlorophyll harvest photons and transfer light energy to the reaction-center chlorophyll
harvest photons and transfer light energy to the reaction-center chlorophyll
122
Where does the Calvin cycle take place? stroma of the chloroplast chlorophyll molecule outer membrane of the chloroplast cytoplasm surrounding the chloroplast thylakoid membrane
stroma of the chloroplast
123
Which of the events listed below occur in the light reactions of photosynthesis? NADP is produced. light is absorbed and funneled to reaction-center chlorophyll a. NADPH is reduced to NADP+ carbon dioxide is incorporated into PGA. ATP is phosphorylated to yield ADP.
light is absorbed and funneled to reaction-center chlorophyll *a.*
124
In a plant cell, where are the ATP synthase complexes located? plasma membrane thylakoid membrane thylakoid membrane, plasma membrane and inner mitochondrial membrane thylakoid membrane and inner mitochondrial membrane inner mitochondrial membrane
thylakoid membrane and inner mitochondrial membrane
125
In mitochondria, chemiosmosis translocates protons from the matrix into the intermembrane space, whereas in chloroplasts, chemiosmosis translocates protons from the stroma to the thylakoid space. the matrix to the stroma. the intermembrane space to the matrix. ATP synthase to NADP+ reductase. the stroma to the photosystem II.
the stroma to the thylakoid space.
126
Synthesis of ATP by the chemiosmotic mechanism occurs during both photosynthesis and respiration. neither photosynthesis nor respiration. photorespiration. photosynthesis. respiration.
both photosynthesis and respiration.
127
Generation of proton gradients across membranes occurs during respiration. neither photosynthesis nor respiration. photorespiration. both photosynthesis and respiration. photosynthesis.
both photosynthesis and respiration.
128
*For the following question, compare the light reactions with the Calvin cycle of photosynthesis in plants.* Produces molecular oxygen (O2) both the light reactions and the Calvin cycle the Calvin cycle alone light reactions alone neither the light reactions nor the Calvin cycle occurs in the chloroplast but is not part of photosynthesis
light reactions alone
129
*For the following question, compare the light reactions with the Calvin cycle of photosynthesis in plants.* Produces NADPH occurs in the chloroplast but is not part of photosynthesis the Calvin cycle alone neither the light reactions nor the Calvin cycle both the light reactions and the Calvin cycle light reactions alone
light reactions alone
130
Carbon fixation involves the addition of carbon dioxide to \_\_\_\_\_. RuBP NADPH 3-PGA G3P Rubisco
RuBP
131
After 3-PGA is phosphorylated, it is reduced by \_\_\_\_\_. CO2 ATP NADP+ ADP NADPH
NADPH
132
How many carbon dioxide molecules must be added to RuBP to make a single molecule of glucose? 8 10 4 6 2
6
133
In the Calvin cycle, how many ATP molecules are required to regenerate RuBP from five G3P molecules? 1 4 2 5 3
3
134
Which of the following statements best represents the relationships between the light reactions and the Calvin cycle? The light reactions provide the Calvin cycle with oxygen for electron flow, and the Calvin cycle provides the light reactions with water to split. There is no relationship between the light reactions and the Calvin cycle. The light reactions supply the Calvin cycle with CO2 to produce sugars, and the Calvin cycle supplies the light reactions with sugars to produce ATP. The light reactions provide ATP and NADPH to the carbon fixation step of the Calvin cycle, and the cycle provides water and electrons to the light reactions. The light reactions provide ATP and NADPH to the Calvin cycle, and the cycle returns ADP, Pi, and NADP+ to the light reactions.
The light reactions provide ATP and NADPH to the Calvin cycle, and the cycle returns ADP, Pi, and NADP+ to the light reactions.
135
Where do the enzymatic reactions of the Calvin cycle take place? outer membrane of the chloroplast electron transport chain thylakoid space stroma of the chloroplast thylakoid membranes
stroma of the chloroplast
136
What is the primary function of the Calvin cycle? synthesize simple sugars from carbon dioxide transport RuBP out of the chloroplast split water and release oxygen use NADPH to release carbon dioxide use ATP to release carbon dioxide
synthesize simple sugars from carbon dioxide
137
*For the following question, compare the light reactions with the Calvin cycle of photosynthesis in plants.* Requires ATP occurs in the chloroplast but is not part of photosynthesis neither the light reactions nor the Calvin cycle the Calvin cycle alone both the light reactions and the Calvin cycle light reactions alone
the Calvin cycle alone
138
*For the following question, compare the light reactions with the Calvin cycle of photosynthesis in plants.* Produces NADH occurs in the chloroplast but is not part of photosynthesis the Calvin cycle alone both the light reactions and the Calvin cycle light reactions alone neither the light reactions nor the Calvin cycle
neither the light reactions nor the Calvin cycle
139
*For the following question, compare the light reactions with the Calvin cycle of photosynthesis in plants.* Produces three-carbon sugars the Calvin cycle alone occurs in the chloroplast but is not part of photosynthesis light reactions alone both the light reactions and the Calvin cycle neither the light reactions nor the Calvin cycle
the Calvin cycle alone
140
*For the following question, compare the light reactions with the Calvin cycle of photosynthesis in plants.* Requires CO2 neither the light reactions nor the Calvin cycle the Calvin cycle alone both the light reactions and the Calvin cycle light reactions alone occurs in the chloroplast but is not part of photosynthesis
the Calvin cycle alone
141
*For the following question, compare the light reactions with the Calvin cycle of photosynthesis in plants.* Requires glucose both the light reactions and the Calvin cycle neither the light reactions nor the Calvin cycle light reactions alone the Calvin cycle alone occurs in the chloroplast but is not part of photosynthesis
neither the light reactions nor the Calvin cycle