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AP Biology > AP BIO Chapter 2 Biochemistry > Flashcards

AP BIO Chapter 2 Biochemistry Flashcards

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1
Q

Which of the following is correct about isotopes of carbon?
A) they are all radioactive
B) they contain the same number of neurons but a different number of protons
C) they contain the same number of electrons but are chemically different bcos the number of neutrons is different
D) they are chemically identical bcos they have the same number of electrons

A

D

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2
Q

All of the following are characteristics of water EXCEPT
A) water has a relatively high boiling point
B) water molecules have little attraction for each other
C) water is a universal solvent
D) ice is less dense than water

A

B

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3
Q 
The pH of blood
A) is normally close to 7.4
B) is strongly acidic
C) varies with the needs of the cells
D) is about 6.9
A

A

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4
Q

Chaperonins are involved with
A) holding the two strands of DNA together
B) maintaining the normal pH level of blood
C) proper folding of proteins
D) enantiomers

A

C

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5
Q 
Which of the following is stored in the human live for energy?
A) glucose
B) glycogen
C) glycerol
D) glucagon
A

B

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6
Q

Which of the following is an example of a hydrogen bond?
A) the attraction between the oxygen of one water molecule and the hydrogen of an adjacent molecule
B) the between hydrogen and carbon in glucose or any sugar
C) the peptide bond between amino acids
D) the intramolecular one between hydrogen and oxygen within a molecule of water

A

A

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7
Q

All of the following statements are correct about enzymes EXCEPT
A) they raise the energy of activation of all reactions
B) they enable reactions to occur at a relatively low temperature
C) they remain unchanged during a reaction
D) they are often located within the plasma membrane of the cell

A

A

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8
Q

Which statement is correct about pH?
A) there are no hydrogen ions in a strong basic solution
B) pure water has a neutral pH of 7 bcos the concentration of hydrogen ions equals the concentration of hydroxyl ions.
C) the concentration of a solution with a pH of 5 is 5 times more acidic than a solution w pH 1
D) the concentration of hydrogen ions in a solution w a pH of 2 is 2000 times more acidic than a solution w pH of 4

A

B

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9
Q

Which of the following can be used to determine the rate of an enzyme catalyzed reaction?
A) the rate of substrate formed
B) the decrease in temperature in the system
C) the rate of enzyme used up
D) the rate of substrate used up

A

D

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10
Q 
Which of the following best describes the reaction shown below?
A+B->AB + energy
A)  hydrolysis 
B) an exergonic reaction
C) an endergonic reaction
D) catabolism
A

B

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11
Q 
Which level of protein structure is most related to specificity?
A) tertiary 
B) primary
C) secondary
D) quaternary
A

A

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12
Q 
Weak bond formed between polar molecules-
Select following:
A) hydrogen bond
B) peptide bond
C) glycosidic bond
D) Estér bond
E) amino group
A

A
hydrogen bonds are weak bond attractions between the positively polar hydrogen of the one molecule & the negatively polar oxygen of another molecule

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13
Q 
Bond linking two monosaccharides in glycogen
Select following:
A) hydrogen bond
B) peptide bond
C) glycosidic bond
D) Estér bond
E) amino group
A

C

two monosaccharides or simple sugar are linked together by a glycosidic bond.

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14
Q 
The connecting CO-NH bond in an organic molecule - 
Select following:
A) hydrogen bond
B) peptide bond
C) glycosidic bond
D) Estér bond
E) amino group
A

B

two amino acids are held together by a peptide bond (CO-NH bond)

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15
Q 
Bond that links a fatty acid to a glycerol molecule
Select following:
A) hydrogen bond
B) peptide bond
C) glycosidic bond
D) Estér bond
E) amino group
A

D
fats are composed of three fatty acids and one glycerol molecule. The bond that holds together one of the fatty acids to the glycerol molecules is called an ester bond.

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16
Q 
An example of a functional group -
Select following:
A) hydrogen bond
B) peptide bond
C) glycosidic bond
D) Estér bond
E) amino group
A

E

the amino group is a basic functional group (-NH2)

17
Q 
Which of the following organic molecules is a major storage carbohydrate used to store energy in plants?
A) cellulose
B) maltose
C) fructose
D) starch
E) glycogen
A

D
There are only 2 major storage forms of carbohydrates, starch & glycogen. Starch is the storage form of sugars in plant. Glycogen is storage form of sugars in animals. Cellulose is a structural component of cell wall. Maltose & fructose are monosaccharides.

18
Q 
A solution w a pH of 10 is how many times more basic than a solution w a pH of 8?
A) 2
B) 4
C) 10
D) 100
E) 1000
A

D
A change of one pH equals a tenfold change in hydrogen ion concentration. Therefore, if the pH changes from 8 to 10 (a pH change of 2), the resulting solution is 10x10, or 100 times more basic

19
Q 
The conversion of lactose to glucose and galactose involves the addition of which of the following molecules to the lactose molecule?
A) O2
B) H2
C) ATP
D) H2O
E) NADH
A

D
In order for lactose to be hydrolyzed to glucose and galactose, a water molecule must be added. The other species - O2, H2, ATP, and NADH- will not hydrolyzed lactose.

20
Q 
All of the following organic compounds are polymers EXCEPT
A) starch
B) cellulose
C) polypeptide 
D) glycine
E) glycogen
A

D

Glycine is a simple amino acid, not polymer.

21
Q 
All of the following organic compounds contain a hydroxyl functional group EXCEPT 
A) maltose
B) glucose
C) fructose
D) glycerol
E) triglycerides
A 
E
A triglyceride (a fat) does not have a hydroxyl functional group. That's bcos the hydroxyl groups from the glycerol molecule are involved in forming the bond that makes the triglyceride.
22
Q 
A particular polypeptide contains 90 amino acids. When the polypeptide is completely hydrolyzed, how many water molecules must be added during this process?
A) 2
B) 30
C) 45
D) 89
E) 90
A

D
When you add one water molecule it will break the bonds between two amino acids. Now, if a polypeptide has 90 amino acids linked together u must add 89 molecules of water to break all of the bonds.

23
Q 
All of the following contribute to the unique properties of water EXCEPT
A) cohesion
B) adhesion
C) polarity
D) capillary action
E) low heat capacity
A

E

Water has high heat capacity, not a low one.

AP Biology (8 decks)

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