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Chem II > ch 24 :))))) > Flashcards

ch 24 :))))) Flashcards

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1
Q

A polypeptide is
an addition polymer of amino acids.
a condensation polymer of amino acids.
a polymer of sugar molecules.
a part of nucleic acids.
a polymer of nucleic acids.

A

b

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2
Q

Which of the following is not a lipid?
triglycerides
fatty acids
glycerol
steroids
phospholipids

A

c

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3
Q

How many rings are found in a steroid molecule?

A

a

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4
Q

When a drop of the fatty acid oleic acid (CH3(CH2)7CH=CH(CH2)7CO2H) is added to water it forms a molecule thick layer on the surface of the water. What is the likely orientation of the acid on the water surface?

A

?

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5
Q

Which of the following statements concerning enzyme chemistry is/are correct?
1. Enzymes are biological catalysts.
2. A reaction occurs when substrate binds the enzyme active site.
3. Enzymes catalyze multiple types of reactions.

A

d

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6
Q

Which statement concerning the twenty different α-amino acids widely found in nature is true?

A

d

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7
Q

What carbohydrate is the form in which plants store glucose for future use as cellular fuel?

A

a

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8
Q

The amide linkages in a protein are also called _____ bonds.

A

peptide

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9
Q

The sequence of amino acids linked by peptide bonds is called the _____ structure of a protein.

A

b

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10
Q

Classification of a compound as a lipid is based on the _____ of the compound.

A

e

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11
Q

Which of the following concerning protein structure is not correct?

A

c

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12
Q

Which of the following statements concerning proteins is not correct?

A

e

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13
Q

What is the most prevalent form of the amino acid glycine (R = H) in an aqueous environment when mixed with an excess of strong acid.

A

c

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14
Q

Which DNA or RNA base is guanine?

A

c

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15
Q

How many RNA nucleotides comprise a codon?

A

c

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16
Q

Saturated fats and oils have ___ melting points than unsaturated fats and oils because of greater ___ forces between molecules.

A

b

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17
Q

The fully protonated form of the amino-acid glycine (R=H) may be simply written as H2Gly+. Write the balanced acid dissociation equilibria (Ka1 and Ka2) for this acid.

A

?

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18
Q

The principal compound used to store and transport energy in a cell is called adenosine 5’-triphosphate. Is this statement true or false?

A

true

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19
Q

In the context of polymerase chain reaction, if you start with a single double-stranded DNA molecule, how many double-strabded DNA molecules will you have after 10 amplification cycles?

A

1,024

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20
Q

Which of the following is the product of transcription in protein synthesis?

A

d

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21
Q

The process by which a double stranded of DNA is copied is called ___. In the process, a ___ strand of DNA is produced from each single strand of the original double-stranded DNA.

A

replication; rna?

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22
Q

Starch and cellulose are polysaccharides made up long chains of glucose linked by glycosidic bonds. Despite the identical composition, why can humans digest starch but not cellulose?

A

Humans can digest starches because they have an alpha linkage. We can’t digest cellulose because it has a beta linkage.

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23
Q

Which of the following functional groups is not found in naturally occurring proteins or their amino acid building blocks?

A

not b. or a

24
Q

Which of the following base forms hydrogen bonds with adenine in double-stranded DNA molecule?

A

a

25
Q

Which of the following statements concerning RNA is/are correct?

A

d

26
Q

Which of the following statements concerning metabolism is/are correct?

A

e

27
Q

A fragment of a DNA molecule has the base sequence GACT. Which of the following is the complementary sequence of the DNA fragment?

A

d

28
Q

Which of the following functional groups are not found in carbohydrates?

A

a

29
Q

A phospholipid may include all of the following except

A

d

30
Q

The oxygen that bridges two sugars in a disaccharide is known as a ___ bond.

A

glycosidic

31
Q

Which of the following units is not found in a DNA molecule?

A

b

32
Q

Which of the following amino-acids is not chiral?

A

e

33
Q

Which of the following statements concerning cell membranes is/are correct?

A

b

34
Q

Which of the following represents the linkage connecting amino acids in proteins?

A

a

35
Q

Which of the following statements concerning polysaccharides is/are correct?
1. Humans do not have enzymes that will break down cellulose.
2. Amylopectin and glycogen are both branched chains of glucose.
3. Amylose starch is a linear polysaccharide.

A

e

36
Q

Which of the following is not a polysaccharide?

A

b

37
Q

Given the following reduction potentials,

NAD+ + H+ + 2e− → NADH Ε° = −0.105 V
2H+ + 2e− → H2 Ε° = 0.000 V

calculate the standard reduction potential and identify the reducing agent in the following reaction.

NAD+ + H2 → NADH + 2H+

A

c

38
Q

One way our bodies produce ATP is to couple the formation of ATP from ADP with the hydrolysis of phosphoenopyruvate (PEP), as shown below.

A

b

39
Q

The melting point of lipids depends on the strength of the intermolecular forces present in the solid. Rank the following fatty acids in order of increasing melting point.

A

a

40
Q

An important reaction in the production of energy from sugars (glycolysis) is the reduction of pyruvate to lactate by NADH.

A

e

41
Q

Which of the following statements concerning lipids is/are correct?

A

e

42
Q

Which of the following pairs of compounds form a nucleoside?

A

not b

43
Q

Which of the following is not a component of DNA?

A

c

44
Q

Which of the following reactions is responsible for the formation of glycosidic bonds in disaccharides?

A

not c or a or e

45
Q

The side chains of nonpolar amino acids contain _____.

A

a

46
Q

Which of the following statements concerning protein synthesis is/are correct?

A

e

47
Q

A compound which contains both a positive and negative charge is called a ____.

A

dipolar

48
Q

Which of the following is not a step in protein synthesis?

A

c

49
Q

Aerobic respiration links the oxidation of glucose with the production of ATP form ADP.

A

d

50
Q

Which of the following pairs of compounds form a nucleoside?

A

a

51
Q

How many unique tripeptides can be made from two molecules of valine (val) and one molecule of alanine (ala)?

A

c

52
Q

Which of the following statements concerning carbohydrates is not correct?

A

d

53
Q

What is the functional group corresponding to a peptide bond?

A

c

54
Q

A triose is a monosaccharide with three carbon atoms. The molecular formula of a triose is _____.

A

a

55
Q

A disaccharide is formed when two monosaccharides are linked by the elimination of a molecule of water and the formation of an ether bond. The newly formed C⎯O bond linking the monosaccharides is called the ____ bond.

A

e

56
Q

What is the general formula for carbohydrates?

A

not c or e maybe d

57
Q

What is the role of tRNA in protein synthesis?

A

to decode the codons

Chem II (13 decks)

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