Question 1

Which of the following pairs of elements are present in proteins, but not in most carbohydrates?

Accepted Answer

A)  nitrogen and sulfur
B)  carbon and hydrogen
C)  carbon and oxygen
D)  sulfur and oxygen
E)  nitrogen and oxygen

Question 2

Proteins are long chains of amino acids joined together by peptide bonds.Which of the following properly depicts the peptide bond formed between two generic amino acids?

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 3

Which of the following kinds of proteins are biochemical catalysts?

Accepted Answer

A)  nutrient proteins
B)  hormones
C)  transport proteins
D)  enzymes
E)  antigens

Question 4

The formation of a peptide bond is best described as which of the following?

Accepted Answer

A)  neutralization reaction
B)  dehydration reaction
C)  hydration reaction
D)  hydrogenation reaction
E)  oxidation reaction

Question 5

What is meant by the "tertiary structure" of a protein?

Accepted Answer

A)  It refers to the peptide bonds that join the amino acids together in the protein chain.
B)  It describes the unique sequence of amino acids in the protein chain.
C)  It describes the regular, repeating structures found in the protein chain.
D)  It describes the overall three dimensional shape of a protein.
E)  It describes the association of two or more polypeptide chains to form one functioning protein unit.

Question 6

What level of protein structure specifies the sequence of amino acids in the protein?

Accepted Answer

A)  quaternary
B)  β-pleated sheet
C)  primary
D)  secondary
E)  tertiary

Question 7

What term describes the type of β-pleated sheet in which both peptides are aligned from amino terminus to carboxy terminus?

Accepted Answer

A)  antiparallel
B)  perpendicular
C)  parallel
D)  matched
E)  congruent

Question 8

Which of the statements concerning the peptide shown below is FALSE?

Accepted Answer

A)  It is a tripeptide.
B)  Its primary structure is Gly-Pro-Ser.
C)  There are two peptide bonds.
D)  The carboxyl group of Pro is joined to the amino group of Ser.
E)  The peptide contains only hydrophobic amino acid residues.

Question 9

Which amino acid has a methyl group as its R group?

Accepted Answer

A)  glycine
B)  alanine
C)  lysine
D)  valine
E)  tyrosine

Question 10

The amino acid 5-hydroxylysine is found in collagen.Which of the following represents the structure of this unusual amino acid?

Accepted Answer

A)  I
B)  II
C)  III
D)  IV
E)  None of the structures represent 5-hydroxylysine.

Question 11

Denaturation of a protein results in the loss of its native conformation and its biological activity.Which of the following best describes what happens when a protein is denatured?

Accepted Answer

A)  The primary structure of the protein is altered.
B)  Peptide bonds are broken, and individual amino acids are released.
C)  Secondary, tertiary, or quaternary levels of structure are disrupted.
D)  The N-terminal and C-terminal ends of the protein form their zwitterions.
E)  The N-terminal and C-terminal ends of the protein are hydrolyzed.

Question 12

What is meant by the "quaternary structure" of a protein?

Accepted Answer

A)  It refers to the four atoms that make up the peptide bonds that join the amino acids together in the protein chain.
B)  It describes the unique sequence of four amino acids in the protein chain.
C)  It describes the four regular, repeating structures found in the protein chain.
D)  It describes the overall three dimensional shape of a protein.
E)  It describes the association of two or more polypeptide chains to form one functioning protein unit.

Question 13

Which hydrophobic amino acid contains a sulfur atom in its side chain?

Accepted Answer

A)  alanine
B)  valine
C)  phenylalanine
D)  proline
E)  methionine

Question 14

Which of the following is a source of complete protein?

Accepted Answer

A)  beans
B)  rice
C)  peanuts
D)  wheat
E)  chicken

Question 15

Which of the following are proteins produced by the immune system in response to foreign substances in the body?

Accepted Answer

A)  transferases
B)  immunoglobulins
C)  insulins
D)  albumins
E)  myoglobins

Question 16

Consider the following forms of the amino acid alanine (Ala) .Which statement concerning these structures is FALSE?

Accepted Answer

A)  Structure I represents the form of Ala present in the blood at physiological pH.
B)  Structure II represents the form of Ala present in the basic environment of the intestines.
C)  Structure III represents the form of Ala present in the acidic environment of the stomach.
D)  Structure IV represents the zwitterion of Ala.
E)  None of the statements are false.

Question 17

In the α-helical structure of proteins, how many amino acid residues are there in one complete full turn of the helix?

Accepted Answer

A)  2
B)  3.6
C)  4
D)  6
E)  greater than 10

Question 18

Which amino acid contains an aromatic ring in its side chain?

Accepted Answer

A)  alanine
B)  glycine
C)  isoleucine
D)  tyrosine
E)  threonine

Question 19

Glycoproteins are often found as receptors on the surface of cells.

Accepted Answer

A) True 
 B)False

Question 20

Blood proteins will become denatured when they develop an overall negative charge.This would be the result of which of the following?

Accepted Answer

A)  a lowering of pH
B)  an increase in pH
C)  a lowering of the partial pressure of oxygen
D)  an increase in the partial pressure of oxygen
E)  poor circulation

Exam 18: Protein Structure and Function

Which of the statements concerning the peptide shown below is FALSE?

Correct AnswerverifiedShow Answer

The formation of a peptide bond is best described as which of the following?

Correct AnswerverifiedShow Answer

What is meant by the "tertiary structure" of a protein?

Correct AnswerverifiedShow Answer

Which amino acid has a methyl group as its R group?

Correct AnswerverifiedShow Answer

Which of the following kinds of proteins are biochemical catalysts?

Correct AnswerverifiedShow Answer

What term describes the type of β-pleated sheet in which both peptides are aligned from amino terminus to carboxy terminus?

Correct AnswerverifiedShow Answer

Consider the following forms of the amino acid alanine (Ala) .Which statement concerning these structures is FALSE?

Correct AnswerverifiedShow Answer

Which of the following pairs of elements are present in proteins, but not in most carbohydrates?

Correct AnswerverifiedShow Answer

Which amino acid contains an aromatic ring in its side chain?

Correct AnswerverifiedShow Answer

Which hydrophobic amino acid contains a sulfur atom in its side chain?

Correct AnswerverifiedShow Answer

Which of the following is a source of complete protein?

Correct AnswerverifiedShow Answer

Denaturation of a protein results in the loss of its native conformation and its biological activity.Which of the following best describes what happens when a protein is denatured?

Correct AnswerverifiedShow Answer

The amino acid 5-hydroxylysine is found in collagen.Which of the following represents the structure of this unusual amino acid?

Correct AnswerverifiedShow Answer

Glycoproteins are often found as receptors on the surface of cells.

Correct AnswerverifiedShow Answer

In the α-helical structure of proteins, how many amino acid residues are there in one complete full turn of the helix?

Correct AnswerverifiedShow Answer

What is meant by the "quaternary structure" of a protein?

Correct AnswerverifiedShow Answer

Proteins are long chains of amino acids joined together by peptide bonds.Which of the following properly depicts the peptide bond formed between two generic amino acids?

Correct AnswerverifiedShow Answer

Blood proteins will become denatured when they develop an overall negative charge.This would be the result of which of the following?

Correct AnswerverifiedShow Answer

Which of the following are proteins produced by the immune system in response to foreign substances in the body?

Correct AnswerverifiedShow Answer

What level of protein structure specifies the sequence of amino acids in the protein?

Correct AnswerverifiedShow Answer

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