Question 1

In digestion, proteins are broken down into amino acids in a(n)________ reaction.

Accepted Answer

A) hydrolysis 
B) saponification 
C) reduction 
D) oxidation 
E) denaturation 
A) hydrolysis 
B) saponification 
C) reduction 
D) oxidation 
E) denaturation

Question 2

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

Accepted Answer

A) complete. 
B) polar. 
C) nonpolar. 
D) incomplete. 
E) essential. 
A) complete. 
B) polar. 
C) nonpolar. 
D) incomplete. 
E) essential.

Question 3

The following amino acid R group is

Accepted Answer

A) acidic. 
B) basic. 
C) hydrophilic. 
D) hydrophobic. 
E) polar. 
A) acidic. 
B) basic. 
C) hydrophilic. 
D) hydrophobic. 
E) polar.

Question 4

Within hemoglobin, the heme functions as

Accepted Answer

A)  one of the four protein subunits. 
B)  an   subunit. 
C)  an oxygen carrier. 
D)  a reducing agent. 
E)  a disulfide bridge. 
A)  one of the four protein subunits. 
B)  an   subunit. 
C)  an oxygen carrier. 
D)  a reducing agent. 
E)  a disulfide bridge.

Question 5

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

Accepted Answer

A) milk 
B) eggs 
C) steak 
D) beans 
E) ham 
A) milk 
B) eggs 
C) steak 
D) beans 
E) ham

Question 6

Which of the following is a secondary protein structure?

Accepted Answer

A)    
B)  disulfide bond 
C)  salt bridges 
D)  Ser-Met-Ala-Gly-Ile 
E)  hydrophobic interactions 
A)    
B)  disulfide bond 
C)  salt bridges 
D)  Ser-Met-Ala-Gly-Ile 
E)  hydrophobic interactions

Question 7

Methionine is an amino acid that contains

Accepted Answer

A) a sodium atom. 
B) a sulfur atom. 
C) a chlorine atom. 
D) a heterocyclic ring. 
E) a phenyl ring. 
A) a sodium atom. 
B) a sulfur atom. 
C) a chlorine atom. 
D) a heterocyclic ring. 
E) a phenyl ring.

Question 8

One heavy metal that can cause denaturation of a protein is

Accepted Answer

A) silver. 
B) barium. 
C) calcium. 
D) iron. 
E) sodium. 
A) silver. 
B) barium. 
C) calcium. 
D) iron. 
E) sodium.

Question 9

In the peptide Ala-Try-Gly-Phe, the N-terminal amino acid is

Accepted Answer

A) phenylalanine. 
B) alanine. 
C) tryptophan. 
D) glycine. 
E) aspartic acid. 
A) phenylalanine. 
B) alanine. 
C) tryptophan. 
D) glycine. 
E) aspartic acid.

Question 10

Immunoglobulin, a protein that stimulates immune responses, would be classified as a ________ protein.

Accepted Answer

A) protection 
B) catalytic 
C) storage 
D) transport 
E) structural 
A) protection 
B) catalytic 
C) storage 
D) transport 
E) structural

Question 11

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

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 12

Which of the following is the correct structure for Ser-Ala-Asp? The R groups are

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 13

In sickle-cell anemia, the hemoglobin molecules

Accepted Answer

A) undergo crenation. 
B) clump together into insoluble fibers. 
C) enlarge to twice normal size. 
D) come apart into separate chains. 
E) dissolve in the plasma. 
A) undergo crenation. 
B) clump together into insoluble fibers. 
C) enlarge to twice normal size. 
D) come apart into separate chains. 
E) dissolve in the plasma.

Question 14

Give the correct name and three and one letter abbreviation for the amino acid shown.

Accepted Answer

A)  Valine, Vle, V 
B)  Alanine, Ala, A 
C)  Valine, Val, V 
D)  Isoleucine, Iso, I 
E)  Leucine, Leu,  L 
A)  Valine, Vle, V 
B)  Alanine, Ala, A 
C)  Valine, Val, V 
D)  Isoleucine, Iso, I 
E)  Leucine, Leu,  L

Question 15

Amino acids that are not synthesized in the body but must be ingested with the diet are called ________ amino
acids.

Accepted Answer

The answer of Amino acids that are not synthesized in...

Question 16

The heme in hemoglobin

Accepted Answer

A)  binds oxygen. 
B)  is a pleated sheet area in the hemoglobin molecule. 
C)  is a protein chain. 
D)  is a helix area in the hemoglobin molecule. 
E)  is an oxygen molecule within the hemoglobin molecule. 
A)  binds oxygen. 
B)  is a pleated sheet area in the hemoglobin molecule. 
C)  is a protein chain. 
D)  is a helix area in the hemoglobin molecule. 
E)  is an oxygen molecule within the hemoglobin molecule.

Question 17

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

Accepted Answer

A) corn and beans. 
B) almonds and walnuts. 
C) wheat and corn. 
D) wheat and rice. 
E) rice and beans. 
A) corn and beans. 
B) almonds and walnuts. 
C) wheat and corn. 
D) wheat and rice. 
E) rice and beans.

Question 18

Heat denatures a protein by disrupting

Accepted Answer

A) ionic bonds and peptide bonds. 
B) hydrogen bonds and disulfide bonds. 
C) hydrophobic bonds and hydrogen bonds. 
D) disulfide bonds and peptide bonds. 
E) peptide bonds and hydrophobic bonds. 
A) ionic bonds and peptide bonds. 
B) hydrogen bonds and disulfide bonds. 
C) hydrophobic bonds and hydrogen bonds. 
D) disulfide bonds and peptide bonds. 
E) peptide bonds and hydrophobic bonds.

Question 19

Which of the following is an example of a secondary protein structure?

Accepted Answer

A) fatty acid 
B) amino acid 
C) dipeptide 
D) a helix 
E) triglyceride 
A) fatty acid 
B) amino acid 
C) dipeptide 
D) a helix 
E) triglyceride

Question 20

The protein that transports oxygen in the blood is ________.

Accepted Answer

The answer of The protein that transports oxygen in the...

Exam 19: Amino Acids and Proteins

In digestion, proteins are broken down into amino acids in a(n)________ reaction.

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

The following amino acid R group is

Within hemoglobin, the heme functions as

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

Which of the following is a secondary protein structure?

Methionine is an amino acid that contains

One heavy metal that can cause denaturation of a protein is

In the peptide Ala-Try-Gly-Phe, the N-terminal amino acid is

Immunoglobulin, a protein that stimulates immune responses, would be classified as a ________ protein.

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

Which of the following is the correct structure for Ser-Ala-Asp? The R groups are

In sickle-cell anemia, the hemoglobin molecules

Give the correct name and three and one letter abbreviation for the amino acid shown.

Amino acids that are not synthesized in the body but must be ingested with the diet are called ________ amino acids.

The heme in hemoglobin

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

Heat denatures a protein by disrupting

Which of the following is an example of a secondary protein structure?

The protein that transports oxygen in the blood is ________.

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