Question 1

What is indicated by the arrow pointing to part of the Fischer projection below?

Accepted Answer

A)   Nothing, this is just two molecules with their bonds crossed.
B)   This is a carbon in the side chain of an amino acid.
C)   This is the alpha carbon of an amino acid.
D)   This is a carbon with a planar geometry.
E)   This can be any type of atom.F) B) and C)
G) C) and E)

Question 2

Which amino acid side chain is capable of hydrogen?

Accepted Answer

A)   -CH3
B)   -CH2OH
C)   -COOH
D)   -CH2CH2SCH3
E)   All of the above are capable.F) B) and E)
G) B) and D)

Question 3

Alpha-helices and β-pleated sheets are both examples of

Accepted Answer

A)   primary structure.
B)   secondary structure.
C)   tertiary structure.
D)   quaternary structure.
E)   both secondary and tertiary structure.F) A) and D)
G) C) and D) B

Question 4

An example of this type of protein is shown below.

Accepted Answer

A)   keratin
B)   keratin, elastin, and collagen
C)   membrane proteins and globular proteins
D)   globular proteins
E)   membrane proteinsF) A) and C)
G) B) and D)

Question 5

Which statement BEST describes the induced-fit model of enzyme action?

Accepted Answer

A)   In this model, the enzyme changes the shape of a substrate using a cofactor.
B)   In this model, the enzyme adjusts it shape to adapt to the shape of the substrate.
C)   In this model, the enzyme induces a change of polarity in the substrate that results in bonding.
D)   In this model, the enzyme's active site is complementary to the shape of the substrate.
E)   In this model, the enzyme's active site chemically reacts with the substrate.F) A) and E)
G) All of the above

Question 6

Most naturally occurring amino acids are the ______-isomer and most naturally occurring carbohydrates are the ______-isomer.

Accepted Answer

A)   L; D
B)   D; L
C)   D; D
D)   L; D.
E)   Amino acids and carbohydrates naturally exist as racemic mixtures.F) A) and B)
G) A) and C) A

Question 7

Which statement BEST describes the naming convention for peptides?

Accepted Answer

A)   There is no naming convention.
B)   Start from the C-terminus and continue in order to the N-terminus.
C)   Start on the left and continue in order to the right.
D)   Start from the N-terminus and continue in order to the C-terminus.
E)   Start on the right and continue in order to the left.F) A) and B)
G) B) and E)

Question 8

The following compound is a(n)

Accepted Answer

A)   amino acid.
B)   dipeptide.
C)   tripeptide.
D)   polypeptide.
E)   protein.F) C) and D)
G) A) and D)

Question 9

Physiological pH is a pH of approximately

Accepted Answer

A)   5.7.
B)   7.4.
C)   8.1.
D)   9.1.
E)   0.F) A) and D)
G) B) and C)

Question 10

Inflammation and pain caused by injury results from the production of molecules called prostaglandins.Aspirin and other anti-inflammatories work by binding to the active site of an enzyme that produces the prostaglandins, thus preventing their synthesis.What type of molecule is aspirin?

Accepted Answer

A)   a cofactor
B)   a substrate
C)   a competitive inhibitor
D)   a noncompetitive inhibitor
E)   a coenzymeF) All of the above
G) A) and E)

Question 11

Which statement BEST describes how an enzyme lowers the activation energy of a reaction?

Accepted Answer

A)   The enzyme covalently binds to the substrate, lowering its energy.
B)   The enzyme chemically reacts with the substrate to make it more reactive.
C)   The enzyme increases the temperature of the substrate, making it more reactive.
D)   The substrate is held in the correct orientation for the reaction to occur.
E)   All of the above describe how an enzyme lowers the activation energy.F) B) and C)
G) A) and E)

Question 12

Which level of architecture is not affected by denaturation?

Accepted Answer

A)   primary
B)   secondary
C)   tertiary
D)   quaternary
E)   All levels of architecture are affected by denaturation.F) All of the above
G) D) and E)

Question 13

Not all proteins have this level of protein architecture.

Accepted Answer

A)   primary structure
B)   secondary structure
C)   tertiary structure
D)   quaternary structure
E)   both secondary and tertiary structuresF) All of the above
G) None of the above

Question 14

This is a regular folding pattern in localized regions of the polypeptide backbone.

Accepted Answer

A)   primary structure
B)   secondary structure
C)   tertiary structure
D)   quaternary structure
E)   both secondary and tertiary structuresF) A) and E)
G) C) and D)

Question 15

Which statement about secondary structures is FALSE?

Accepted Answer

A)   Some proteins only contain α-helices or β sheets.
B)   Structural proteins often contain only β sheets.
C)   Secondary structure is stabilized by hydrogen bonding between amides in the polypeptide backbone.
D)   Side chains are involved in the hydrogen bonds that stabilize the secondary structure.
E)   A protein can contain both α-helices and β sheets.F) B) and D)
G) A) and E)

Question 16

Which choice shows how an amino acid reacts in a low pH solution?

Accepted Answer

A)   choice a
B)   choice b
C)   choice c
D)   choice d
E)   All of these reactions occur to the same extent in a solution with a pH less than 7.F) A) and B)
G) All of the above

Question 17

Which type of protein provides physical support to tissues?

Accepted Answer

A)   receptors
B)   structural proteins
C)   immunoglobulins
D)   transport proteins
E)   dietary proteinsF) A) and B)
G) B) and E)

Question 18

Is this amino acid L- or D-, and how can you tell?

Accepted Answer

A)   L-, because all amino acids are L
B)   D-, because all amino acids are D
C)   D-, because the amine is on the right
D)   D-, because the amine is on the left
E)   L-, because the amine is on the leftF) C) and D)
G) All of the above C

Question 19

Which side chain would MOST likely be involved in hydrogen bonding?

Accepted Answer

A)   -CH2OH
B)   -CH2SH
C)   -CH2COOH
D)   -CH2CONH2
E)   2OH 
B)   -CH2SH 
C)   -CH2COOH 
D)   -CH2CONH2 
E)    " class="answers-bank-image d-inline" rel="preload" >F) C) and D)
G) A) and B)

Question 20

The following table lists several common vegetarian foods and the amino acids that they are missing.Which of the following combinations supply a complete protein when consumed together? ​
Food
Missing amino acid(s) 
Beans
Methionine and tryptophan
Corn
Lysine and tryptophan
Peas
Methionine
Rice
Lysine
Walnuts
Lysine and tryptophan
Wheat
Lysine
​

Accepted Answer

A)   wheat and corn
B)   corn and beans
C)   beans and peas
D)   peas and corn
E)   beans and walnutsF) None of the above
G) D) and E)

Exam 16: Proteins: Structure and Function

What is indicated by the arrow pointing to part of the Fischer projection below?

Correct Answer
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Which amino acid side chain is capable of hydrogen?

Correct Answer
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Alpha-helices and β-pleated sheets are both examples of

Correct Answer
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B

An example of this type of protein is shown below.

Correct Answer
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Which statement BEST describes the induced-fit model of enzyme action?

Correct Answer
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Most naturally occurring amino acids are the -isomer and most naturally occurring carbohydrates are the -isomer.

Correct Answer
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A

Which statement BEST describes the naming convention for peptides?

Correct Answer
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The following compound is a(n)

Correct Answer
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Physiological pH is a pH of approximately

Correct Answer
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Inflammation and pain caused by injury results from the production of molecules called prostaglandins.Aspirin and other anti-inflammatories work by binding to the active site of an enzyme that produces the prostaglandins, thus preventing their synthesis.What type of molecule is aspirin?

Correct Answer
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Which statement BEST describes how an enzyme lowers the activation energy of a reaction?

Correct Answer
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Which level of architecture is not affected by denaturation?

Correct Answer
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Not all proteins have this level of protein architecture.

Correct Answer
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This is a regular folding pattern in localized regions of the polypeptide backbone.

Correct Answer
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Which statement about secondary structures is FALSE?

Correct Answer
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Which choice shows how an amino acid reacts in a low pH solution?

Correct Answer
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Which type of protein provides physical support to tissues?

Correct Answer
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Is this amino acid L- or D-, and how can you tell?

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C

Which side chain would MOST likely be involved in hydrogen bonding?

Correct Answer
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Exam 16: Proteins: Structure and Function

What is indicated by the arrow pointing to part of the Fischer projection below?

Correct AnswerverifiedShow Answer

Which amino acid side chain is capable of hydrogen?

Correct AnswerverifiedShow Answer

Alpha-helices and β-pleated sheets are both examples of

Correct AnswerverifiedB

An example of this type of protein is shown below.

Correct AnswerverifiedShow Answer

Which statement BEST describes the induced-fit model of enzyme action?

Correct AnswerverifiedShow Answer

Most naturally occurring amino acids are the ______-isomer and most naturally occurring carbohydrates are the ______-isomer.

Correct AnswerverifiedA

Which statement BEST describes the naming convention for peptides?

Correct AnswerverifiedShow Answer

The following compound is a(n)

Correct AnswerverifiedShow Answer

Physiological pH is a pH of approximately

Correct AnswerverifiedShow Answer

Inflammation and pain caused by injury results from the production of molecules called prostaglandins.Aspirin and other anti-inflammatories work by binding to the active site of an enzyme that produces the prostaglandins, thus preventing their synthesis.What type of molecule is aspirin?

Correct AnswerverifiedShow Answer

Which statement BEST describes how an enzyme lowers the activation energy of a reaction?

Correct AnswerverifiedShow Answer

Which level of architecture is not affected by denaturation?

Correct AnswerverifiedShow Answer

Not all proteins have this level of protein architecture.

Correct AnswerverifiedShow Answer

This is a regular folding pattern in localized regions of the polypeptide backbone.

Correct AnswerverifiedShow Answer

Which statement about secondary structures is FALSE?

Correct AnswerverifiedShow Answer

Which choice shows how an amino acid reacts in a low pH solution?

Correct AnswerverifiedShow Answer

Which type of protein provides physical support to tissues?

Correct AnswerverifiedShow Answer

Is this amino acid L- or D-, and how can you tell?

Correct AnswerverifiedC

Which side chain would MOST likely be involved in hydrogen bonding?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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B

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Most naturally occurring amino acids are the -isomer and most naturally occurring carbohydrates are the -isomer.

Correct Answer
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A

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C

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