Question 1

Which amino acid accounts for about 33% of the collagen structure?

Accepted Answer

A)  alanine 
B)  glycine 
C)  hydroxyproline 
D)  proline 
A)  alanine 
B)  glycine 
C)  hydroxyproline 
D)  proline

Question 2

In which of the following do both amino acids have a basic side chain?

Accepted Answer

A)  cysteine and glycine 
B)  cysteine and methionine 
C)  histidine and lysine 
D)  phenylalanine and tryptophan 
A)  cysteine and glycine 
B)  cysteine and methionine 
C)  histidine and lysine 
D)  phenylalanine and tryptophan

Question 3

How many dipeptides can be made using the 20 standard amino acids?

Accepted Answer

A)  20 
B)  40 
C)  200 
D)  400 
A)  20 
B)  40 
C)  200 
D)  400

Question 4

Which of the following proteins has an extended helix secondary structure?

Accepted Answer

A)  collagen 
B)  keratin 
C)  silk 
D)  none of these 
A)  collagen 
B)  keratin 
C)  silk 
D)  none of these

Question 5

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

Accepted Answer

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

Question 6

How many different tripeptides can be made from glycine, alanine, and valine if the tripeptide contains each amino acid only once?

Accepted Answer

A)  3 
B)  6 
C)  18 
D)  36 
A)  3 
B)  6 
C)  18 
D)  36

Question 7

What is the relationship between Ala−Gly and Gly−Ala?

Accepted Answer

A)  They are the same substance. 
B)  They are allotropes. 
C)  They are isomers. 
D)  They are mirror images. 
A)  They are the same substance. 
B)  They are allotropes. 
C)  They are isomers. 
D)  They are mirror images.

Question 8

Secondary structure is associated with which of the following?

Accepted Answer

A)  the sequence of amino acids 
B)  hydrogen bonding within the backbone 
C)  hydrogen bonding between the side chains 
D)  the interaction of protein subunits 
A)  the sequence of amino acids 
B)  hydrogen bonding within the backbone 
C)  hydrogen bonding between the side chains 
D)  the interaction of protein subunits

Question 9

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

Accepted Answer

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

Question 10

Which of the following side chains are hydrophilic?

Accepted Answer

A)  acidic 
B)  basic 
C)  polar but neutral 
D)  all of these 
A)  acidic 
B)  basic 
C)  polar but neutral 
D)  all of these

Question 11

Which amino acid is involved in the cross-linking found in insoluble collagen?

Accepted Answer

A)  isoleucine 
B)  leucine 
C)  lysine 
D)  proline 
A)  isoleucine 
B)  leucine 
C)  lysine 
D)  proline

Question 12

Consider the complex formed between myoglobin and CO.   Which of the following correctly describes this substance?

Accepted Answer

A)  There are four coordinate covalent bonds in the structure. 
B)  Fe(II) has four d electrons. 
C)  Fe obeys the 18-electron rule. 
D)  All of the above are correct for this substance. 
A)  There are four coordinate covalent bonds in the structure. 
B)  Fe(II) has four d electrons. 
C)  Fe obeys the 18-electron rule. 
D)  All of the above are correct for this substance.

Question 13

Which of the following is true of proteins?

Accepted Answer

A)  All proteins are acidic. 
B)  All proteins are basic. 
C)  All proteins are neutral. 
D)  The acid/base properties of a protein depend on the identity of its side chains. 
A)  All proteins are acidic. 
B)  All proteins are basic. 
C)  All proteins are neutral. 
D)  The acid/base properties of a protein depend on the identity of its side chains.

Question 14

In which of the following do both amino acids contain a sulfur atom?

Accepted Answer

A)  cysteine and glycine 
B)  cysteine and methionine 
C)  histidine and methionine 
D)  phenylalanine and tryptophan 
A)  cysteine and glycine 
B)  cysteine and methionine 
C)  histidine and methionine 
D)  phenylalanine and tryptophan

Question 15

Proteins are associated with which of the following functions?

Accepted Answer

A)  catalysis 
B)  movement 
C)  storage 
D)  all of these 
A)  catalysis 
B)  movement 
C)  storage 
D)  all of these

Question 16

Which of the following pairs of amino acids has hydrophobic interactions?

Accepted Answer

A)  alanine and glutamic acid 
B)  aspartic acid and lysine 
C)  leucine and phenylalanine 
D)  serine and tyrosine 
A)  alanine and glutamic acid 
B)  aspartic acid and lysine 
C)  leucine and phenylalanine 
D)  serine and tyrosine

Question 17

Which of the following is true of amino acids dissolved in water?

Accepted Answer

A)  They exist in un-ionized form at high pH. 
B)  They exist in un-ionized form at low pH. 
C)  They exist at un-ionized form only at the isoelectric point. 
D)  They do not exist in unionized form at any pH. 
A)  They exist in un-ionized form at high pH. 
B)  They exist in un-ionized form at low pH. 
C)  They exist at un-ionized form only at the isoelectric point. 
D)  They do not exist in unionized form at any pH.

Question 18

Which of the following contains a prosthetic group?

Accepted Answer

A)  collagen 
B)  hemoglobin 
C)  insulin 
D)  none of these 
A)  collagen 
B)  hemoglobin 
C)  insulin 
D)  none of these

Question 19

What type of chemical reaction is involved in the conversion of disulfide bonds to thiols?

Accepted Answer

A)  addition 
B)  reduction 
C)  oxidation 
D)  substitution 
A)  addition 
B)  reduction 
C)  oxidation 
D)  substitution

Question 20

Which of the following amino acids has the highest pI?

Accepted Answer

A)  arginine 
B)  cysteine 
C)  glycine 
D)  glutamic acid 
A)  arginine 
B)  cysteine 
C)  glycine 
D)  glutamic acid

Exam 22: Proteins

Which amino acid accounts for about 33% of the collagen structure?

In which of the following do both amino acids have a basic side chain?

How many dipeptides can be made using the 20 standard amino acids?

Which of the following proteins has an extended helix secondary structure?

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

How many different tripeptides can be made from glycine, alanine, and valine if the tripeptide contains each amino acid only once?

What is the relationship between Ala−Gly and Gly−Ala?

Secondary structure is associated with which of the following?

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

Which of the following side chains are hydrophilic?

Which amino acid is involved in the cross-linking found in insoluble collagen?

Consider the complex formed between myoglobin and CO. Which of the following correctly describes this substance?

Which of the following is true of proteins?

In which of the following do both amino acids contain a sulfur atom?

Proteins are associated with which of the following functions?

Which of the following pairs of amino acids has hydrophobic interactions?

Which of the following is true of amino acids dissolved in water?

Which of the following contains a prosthetic group?

What type of chemical reaction is involved in the conversion of disulfide bonds to thiols?

Which of the following amino acids has the highest pI?

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