Question 1

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

Accepted Answer

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

Question 2

Which R group would most likely be found in a hydrophobic area of the tertiary structure of a globular protein?

Accepted Answer

A) -CH2OH 
B) -CH2COO- 
C)    
D)   
E)    
A) -CH2OH 
B) -CH2COO- 
C)    
D)   
E)

Question 3

The peptide bonds that combine amino acids in a protein are

Accepted Answer

A) ester bonds. 
B) ether bonds. 
C) amide bonds. 
D) glycosidic bonds. 
E) sulfide bonds. 
A) ester bonds. 
B) ether bonds. 
C) amide bonds. 
D) glycosidic bonds. 
E) sulfide bonds.

Question 4

A basic amino acid has an R group that contains

Accepted Answer

A) an amine group. 
B) a carboxyl group. 
C) a methyl group. 
D) an alcohol group. 
E) a thiol group. 
A) an amine group. 
B) a carboxyl group. 
C) a methyl group. 
D) an alcohol group. 
E) a thiol group.

Question 5

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

Accepted Answer

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

Question 6

In insulin, two peptide chains are held together in a single unit by

Accepted Answer

A) disulfide bridges. 
B) hydrogen bonds. 
C) salt bridges. 
D) a prosthetic group. 
E) a β-pleated sheet. 
A) disulfide bridges. 
B) hydrogen bonds. 
C) salt bridges. 
D) a prosthetic group. 
E) a β-pleated sheet.

Question 7

The secondary structure of collagen is distinguished by

Accepted Answer

A) single α helix strands. 
B) double α helix strands. 
C) many α helixes wound into fibrils. 
D) a braided triple helix. 
E) many glycoside links. 
A) single α helix strands. 
B) double α helix strands. 
C) many α helixes wound into fibrils. 
D) a braided triple helix. 
E) many glycoside links.

Question 8

Hemoglobin is an example of a protein with

Accepted Answer

A) primary structure only. 
B) two protein chains held together. 
C) a globular structure. 
D) primarily a β-pleated sheet structure. 
E) primarily an α helix structure. 
A) primary structure only. 
B) two protein chains held together. 
C) a globular structure. 
D) primarily a β-pleated sheet structure. 
E) primarily an α helix structure.

Question 9

A peptide bond contains which kind of functional group?

Accepted Answer

A) alcohol 
B) amine 
C) amide 
D) carboxylic acid 
E) ketone 
A) alcohol 
B) amine 
C) amide 
D) carboxylic acid 
E) ketone

Question 10

Sickle-cell anemia is caused by a change in the primary structure of a subunit of the hemoglobin protein.

Accepted Answer

A) True 
 B)False

Question 11

Upon hydrolysis the dipeptide abbreviated as Gly-Lys will yield the same products as the dipeptide abbreviated as Lys-Gly.

Accepted Answer

A) True 
 B)False

Question 12

Acids and bases denature a protein by disrupting

Accepted Answer

A) peptide bonds and ionic bonds. 
B) amide bonds and alkene bonds. 
C) hydrophobic interactions and peptide bonds. 
D) ionic bonds and hydrophobic interactions. 
E) ionic bonds and hydrogen bonds. 
A) peptide bonds and ionic bonds. 
B) amide bonds and alkene bonds. 
C) hydrophobic interactions and peptide bonds. 
D) ionic bonds and hydrophobic interactions. 
E) ionic bonds and hydrogen bonds.

Question 13

Consider the R groups of the following amino acids: cysteine: -CH2SH; alanine: -CH₃ ; serine: -CH2OH The name for the dipeptide shown below is ________.

Accepted Answer

A) alanyl-cysteine 
B) alanyl-serine 
C) seryl-alanine 
D) seryl-cysteine 
E) serine-alanine 
A) alanyl-cysteine 
B) alanyl-serine 
C) seryl-alanine 
D) seryl-cysteine 
E) serine-alanine

Question 14

Enkephalins are polypeptides that have

Accepted Answer

A) a sweet taste. 
B) a bitter taste. 
C) extra caloric value. 
D) pain-killing properties. 
E) hormone activity. 
A) a sweet taste. 
B) a bitter taste. 
C) extra caloric value. 
D) pain-killing properties. 
E) hormone activity.

Question 15

The heme in hemoglobin is a(n)

Accepted Answer

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

Question 16

Disulfide bonds stabilize the tertiary structure of a protein.

Accepted Answer

A) True 
 B)False

Question 17

What amino acids have polar R groups that are attracted to water?

Accepted Answer

A) hydrophilic 
B) hydrophobic 
C) nonpolar 
D) aromatic 
E) hydrocarbon 
A) hydrophilic 
B) hydrophobic 
C) nonpolar 
D) aromatic 
E) hydrocarbon

Question 18

Heat denatures a protein by disrupting

Accepted Answer

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

Question 19

Which of the following is NOT a function of proteins?

Accepted Answer

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 
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

Question 20

At a pH > 9, the zwitterion of glycine (pI=6.0) will have

Accepted Answer

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. 
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.

Exam 19: Amino Acids and Proteins

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

Which R group would most likely be found in a hydrophobic area of the tertiary structure of a globular protein?

The peptide bonds that combine amino acids in a protein are

A basic amino acid has an R group that contains

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

In insulin, two peptide chains are held together in a single unit by

The secondary structure of collagen is distinguished by

Hemoglobin is an example of a protein with

A peptide bond contains which kind of functional group?

Sickle-cell anemia is caused by a change in the primary structure of a subunit of the hemoglobin protein.

Upon hydrolysis the dipeptide abbreviated as Gly-Lys will yield the same products as the dipeptide abbreviated as Lys-Gly.

Acids and bases denature a protein by disrupting

Consider the R groups of the following amino acids: cysteine: -CH2SH; alanine: -CH₃ ; serine: -CH2OH The name for the dipeptide shown below is ________.

Enkephalins are polypeptides that have

The heme in hemoglobin is a(n)

Disulfide bonds stabilize the tertiary structure of a protein.

What amino acids have polar R groups that are attracted to water?

Heat denatures a protein by disrupting

Which of the following is NOT a function of proteins?

At a pH > 9, the zwitterion of glycine (pI=6.0) will have

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