Amino Acids,proteins,and Enzymes

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Question 1
Free
Multiple Choice

Which of the following is not a function of proteins?

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A

provide structural components

B

stores the genetic information of a living organism

C

movement of muscles

D

catalyze reactions in the cells

E

transport substances through the bloodstream

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Question 2
Free
Multiple Choice

Collagen,a protein found in tendons and cartilage,would be classified as a ________ protein.

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A

catalytic

B

structural

C

transport

D

storage

E

hormone

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Question 3
Free
Multiple Choice

Sucrase,the protein that facilitates the hydrolysis of sucrose,would be classified as a ________ protein.

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A

transport

B

hormonal

C

catalytic

D

structural

E

contractile

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Question 4
Free
Multiple Choice

Glycine is the only naturally occurring amino acid that is ________ .

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A

negatively charged

B

positively charged

C

neutral

D

in the L- form

E

achiral

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Question 5
Free
Multiple Choice

A basic amino acid has a side chain that contains ________ .

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A

an ammonium group

B

a carboxyl ate group

C

a methyl group

D

an alcohol group

E

a thiol group

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Question 6
Multiple Choice

In the ionized form of an amino acid,the carboxylic acid end is ________ .

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A
positively charged
B
negatively charged
C
neutral
D
soluble in a nonpolar solvent
E
attached to an amine
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Question 7
Multiple Choice

Methionine is an amino acid that contains ________ .

Choose correct answer/s
A
a sulfur atom
B
a chlorine atom
C
a sodium atom
D
a phenyl ring
E
a heterocyclic ring
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Question 8
Multiple Choice

The structural formulas of amino acids are the same except for the ________ .

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A
carboxylate group
B
alpha carbon
C
ammonium group
D
R group
E
hydrogen bonding
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Question 9
Multiple Choice

Wool is primarily made up of ________ .

Choose correct answer/s
A
protein
B
carbohydrate
C
globin
D
triacylglycerols
E
enkephalin
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Question 10
Multiple Choice

The following amino acid side chain is ________ . -CH-C image | image

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A
polar
B
hydrophobic
C
hydrophilic
D
acidic
E
basic
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Question 11
Multiple Choice

Which of the following functional groups of an amino acid would be in the ionized state at high pH?

Choose correct answer/s
A
O image -C-OH
B
- image -OH
C
- image
D
O image -C image
E
image
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Question 12
Multiple Choice

The side chain for histidine is classified as a ________ side chain.

Choose correct answer/s
A
basic
B
neutral
C
acidic
D
nonpolar
E
polar
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Question 13
Multiple Choice

At a pH > 9,the ionized form of glycine will have ________ .

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A
a net positive charge
B
a net negative charge
C
an overall charge of zero
D
low solubility in water
E
a negative charge on the nitrogen
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Question 14
Multiple Choice

At a pH < 5,the ionized form for alanine (pI = 6)will have ________ .

Choose correct answer/s
A
a net positive charge
B
a net negative charge
C
an overall charge of zero
D
low solubility in water
E
a negative charge on the carboxyl group
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Question 15
Multiple Choice

What is the structural formula of glutamic acid (pI = 3.2)at pH = 1?

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A
image
B
image
C
image
D
image
E
image
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Question 16
Multiple Choice

Which of the following would be most likely to be deficient in at least one essential amino acid?

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A
eggs
B
milk
C
beans
D
steak
E
ham
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Question 17
Multiple Choice

Amino acids that are not synthesized in the body and must be obtained from the diet are called ________ .

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A
essential
B
polar
C
nonpolar
D
complete
E
incomplete
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Question 18
Multiple Choice

A completely vegetarian diet will contain all the essential amino acids if it includes ________ .

Choose correct answer/s
A
wheat and rice
B
rice and beans
C
almonds and walnuts
D
corn and beans
E
wheat and corn
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Question 19
Multiple Choice

The peptide bonds that link amino acids in a protein are ________ .

Choose correct answer/s
A
ester bonds
B
ether bonds
C
amide bonds
D
glycosidic bonds
E
sulfide bonds
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Question 20
Multiple Choice

In the peptide STFNA,the N-terminal amino acid is ________ .

Choose correct answer/s
A
alanine
B
phenylalanine
C
tryptophan
D
aspartic acid
E
serine
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