Question 1

Which of the following amino acids can be easily dimerized?

Accepted Answer

A)   alanine
B)   cysteine
C)   glycine
D)   methionineE) None of the above
F) All of the above

Question 2

Which of the following amino acids absorbs UV radiation at 280 nm?

Accepted Answer

A)   phenylalanine
B)   tryptophan
C)   tyrosine
D)   all of theseE) B) and C)
F) A) and D) D

Question 3

Which of the following is true of the relationship between the primary structure and the function of a protein?

Accepted Answer

A)   A change in one amino acid always affects the function of a protein.
B)   A change in one amino acid may or may not affect the function of a protein.
C)   A change in one amino acid never affects the function of a protein.
D)   The primary structure of a protein and its function are not related.E) C) and D)
F) A) and B)

Question 4

Which of the following statements is true of zwitterions?

Accepted Answer

A)   They are positively charged.
B)   They are negatively charged.
C)   They are electrically neutral.
D)   They are made up of basic amino acids.E) None of the above
F) All of the above

Question 5

Which of the following defines the primary structure of a protein?

Accepted Answer

A)   the geometric arrangement of the backbone atoms of a protein
B)   the geometric arrangement of the side chains of a protein
C)   the sequence of the amino acids in a protein
D)   all of the aboveE) C) and D)
F) A) and D)

Question 6

What is the conformation of the peptide bond that is present between the amino acids in a protein?

Accepted Answer

A)   planar
B)   chair
C)   bent
D)   nonplanarE) All of the above
F) A) and D)

Question 7

Which of the following is true of the atoms in a protein's backbone unit?

Accepted Answer

A)   All of them are in a straight line.
B)   All of them are in the same plane.
C)   All of them have tetrahedral geometry.
D)   None of these are correct.E) A) and D)
F) A) and B) B

Question 8

Identify the correct representation of the given tripeptide.

Accepted Answer

A)   Ala-Cys-Asp
B)   Ala-Cys-Glu
C)   Asp-Cys-Ala
D)   Glu-Cys-AlaE) A) and C)
F) C) and D)

Question 9

Which of the following proteins is a hormone?

Accepted Answer

A)   casein
B)   hemoglobin
C)   insulin
D)   all of theseE) None of the above
F) B) and C)

Question 10

How many naturally occurring amino acids are commonly found in proteins?

Accepted Answer

A)   10
B)   20
C)   25
D)   100E) B) and C)
F) A) and D) B

Question 11

Which of the following pair of amino acids has sulfur-containing side chains?

Accepted Answer

A)   cysteine and glycine
B)   cysteine and methionine
C)   histidine and methionine
D)   phenylalanine and tryptophanE) A) and C)
F) A) and B)

Question 12

How many different tripeptides can be made from glycine and valine?

Accepted Answer

A)   4
B)   6
C)   8
D)   12E) B) and C)
F) C) and D)

Question 13

Which of the following proteins is associated with the movement of muscles?

Accepted Answer

A)   actin
B)   ferritin
C)   hemoglobin
D)   insulinE) None of the above
F) A) and B)

Question 14

Which of the following dipeptides is glycylalanine?

Accepted Answer

A)   
B)   
C)   
D)   E) All of the above
F) None of the above

Question 15

Which of the following amino acids functions as a hormone?

Accepted Answer

A)   leucine
B)   lysine
C)   thyroxine
D)   tyrosineE) A) and B)
F) None of the above

Question 16

Which of the following regions of proteins are affected by the denaturing agent urea?

Accepted Answer

A)   hydrogen bonds
B)   disulfide bonds
C)   hydrophobic regions
D)   salt bridgesE) A) and D)
F) B) and C)

Question 17

What is the most important aspect of an amino acid's side chain?

Accepted Answer

A)   its polarity
B)   its shape
C)   its size
D)   none of theseE) A) and B)
F) A) and C)

Question 18

Which of the following amino acids is not optically active?

Accepted Answer

A)   alanine
B)   glycine
C)   tryptophan
D)   none, all of these are optically activeE) B) and C)
F) None of the above

Question 19

Which pair of the amino acids is the precursors of norepinephrine and epinephrine?

Accepted Answer

A)   aspartic acid and glutamic acid
B)   cysteine and methionine
C)   isoleucine and leucine
D)   phenylalanine and tyrosineE) None of the above
F) B) and D)

Question 20

Which of the following statements is true of the water solubility of proteins?

Accepted Answer

A)   Both fibrous and globular proteins are insoluble in water.
B)   Both fibrous and globular proteins are soluble in water.
C)   Fibrous proteins are insoluble in water.
D)   Globular proteins are insoluble in water.E) A) and B)
F) A) and C)

Exam 21: Proteins

Which of the following amino acids can be easily dimerized?

Correct AnswerverifiedShow Answer

Which of the following amino acids absorbs UV radiation at 280 nm?

Correct AnswerverifiedD

Which of the following is true of the relationship between the primary structure and the function of a protein?

Correct AnswerverifiedShow Answer

Which of the following statements is true of zwitterions?

Correct AnswerverifiedShow Answer

Which of the following defines the primary structure of a protein?

Correct AnswerverifiedShow Answer

What is the conformation of the peptide bond that is present between the amino acids in a protein?

Correct AnswerverifiedShow Answer

Which of the following is true of the atoms in a protein's backbone unit?

Correct AnswerverifiedB

Identify the correct representation of the given tripeptide.

Correct AnswerverifiedShow Answer

Which of the following proteins is a hormone?

Correct AnswerverifiedShow Answer

How many naturally occurring amino acids are commonly found in proteins?

Correct AnswerverifiedB

Which of the following pair of amino acids has sulfur-containing side chains?

Correct AnswerverifiedShow Answer

How many different tripeptides can be made from glycine and valine?

Correct AnswerverifiedShow Answer

Which of the following proteins is associated with the movement of muscles?

Correct AnswerverifiedShow Answer

Which of the following dipeptides is glycylalanine?

Correct AnswerverifiedShow Answer

Which of the following amino acids functions as a hormone?

Correct AnswerverifiedShow Answer

Which of the following regions of proteins are affected by the denaturing agent urea?

Correct AnswerverifiedShow Answer

What is the most important aspect of an amino acid's side chain?

Correct AnswerverifiedShow Answer

Which of the following amino acids is not optically active?

Correct AnswerverifiedShow Answer

Which pair of the amino acids is the precursors of norepinephrine and epinephrine?

Correct AnswerverifiedShow Answer

Which of the following statements is true of the water solubility of proteins?

Correct AnswerverifiedShow Answer

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