Question 1

Which of the following proteins has a predominant β-pleated sheet structure?

Accepted Answer

A)  keratin 
B)  fibroin 
C)  both keratin and fibroin 
D)  neither keratin nor fibroin 
A)  keratin 
B)  fibroin 
C)  both keratin and fibroin 
D)  neither keratin nor fibroin

Question 2

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 3

What is the shape of the oxygen-binding curve of myoglobin?

Accepted Answer

A)  parabolic 
B)  sigmoidal 
C)  sinusoidal 
D)  hyperbolic 
A)  parabolic 
B)  sigmoidal 
C)  sinusoidal 
D)  hyperbolic

Question 4

Identify a statement that is true of the functions of proteins.

Accepted Answer

A)  Ferritin, a protein that is found in the liver, stores iron in the body. 
B)  Hemoglobin, a protein, carries oxygen from cells to the lungs. 
C)  Antigens are proteins that are produced by the body to counteract antibodies. 
D)  Keratin forms the skeletal muscles of the body. 
A)  Ferritin, a protein that is found in the liver, stores iron in the body. 
B)  Hemoglobin, a protein, carries oxygen from cells to the lungs. 
C)  Antigens are proteins that are produced by the body to counteract antibodies. 
D)  Keratin forms the skeletal muscles of the body.

Question 5

How many different tripeptides can be made from 20 amino acids?

Accepted Answer

A)  60 
B)  400 
C)  6840 
D)  8000 
A)  60 
B)  400 
C)  6840 
D)  8000

Question 6

Consider the given image. What type of interaction is depicted by the dotted line in the given image?

Accepted Answer

A)  hydrogen bonding 
B)  covalent bonding 
C)  a hydrophobic interaction 
D)  salt bridges 
E)  a metal ion coordination 
A)  hydrogen bonding 
B)  covalent bonding 
C)  a hydrophobic interaction 
D)  salt bridges 
E)  a metal ion coordination

Question 7

What determines the functions of amino acids?

Accepted Answer

A)  their molecular weight 
B)  their side chain 
C)  both molecular weight and side chain 
D)  neither molecular weight nor side chain 
A)  their molecular weight 
B)  their side chain 
C)  both molecular weight and side chain 
D)  neither molecular weight nor side chain

Question 8

What type of chemical reaction is involved in the formation of cystine from cysteine?

Accepted Answer

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

Question 9

Which of the following is not a fibrous protein?

Accepted Answer

A)  actin 
B)  collagen 
C)  keratin 
D)  None, they are all fibrous proteins. 
A)  actin 
B)  collagen 
C)  keratin 
D)  None, they are all fibrous proteins.

Question 10

Identify the correct naming convention followed while naming a protein or polypeptide.

Accepted Answer

A)  The convention of naming proteins is different from that of polypeptides. 
B)  They are named starting from the C-terminus residue to the N-terminus residue. 
C)  They are named starting from the middle toward both ends. 
D)  They are named starting from the N-terminus residue to the C-terminus residue. 
A)  The convention of naming proteins is different from that of polypeptides. 
B)  They are named starting from the C-terminus residue to the N-terminus residue. 
C)  They are named starting from the middle toward both ends. 
D)  They are named starting from the N-terminus residue to the C-terminus residue.

Question 11

Which of the following proteins 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 12

How does fetal hemoglobin differ from adult hemoglobin?

Accepted Answer

A)  Fetal hemoglobin does not have α-chains. 
B)  Fetal hemoglobin does not have β-chains. 
C)  Fetal hemoglobin does not have γ-chains. 
D)  Fetal hemoglobin does not differ from adult hemoglobin. 
A)  Fetal hemoglobin does not have α-chains. 
B)  Fetal hemoglobin does not have β-chains. 
C)  Fetal hemoglobin does not have γ-chains. 
D)  Fetal hemoglobin does not differ from adult hemoglobin.

Question 13

Which of the following statements is true of the polarity of proteins?

Accepted Answer

A)  All proteins are acidic. 
B)  All proteins are basic. 
C)  All proteins are neutral. 
D)  The polarity of a protein depends on its side chains. 
A)  All proteins are acidic. 
B)  All proteins are basic. 
C)  All proteins are neutral. 
D)  The polarity of a protein depends on its side chains.

Question 14

Which of the following statements is true of all amino acids?

Accepted Answer

A)  All amino acids have a D-isomer. 
B)  All amino acids have an L-isomer. 
C)  The amino group is attached to the carbon atom of the carboxyl group. 
D)  The amino group and the carbon of the carboxyl group are attached to the same carbon atom. 
A)  All amino acids have a D-isomer. 
B)  All amino acids have an L-isomer. 
C)  The amino group is attached to the carbon atom of the carboxyl group. 
D)  The amino group and the carbon of the carboxyl group are attached to the same carbon atom.

Question 15

What is the direction of protein synthesis?

Accepted Answer

A)  from the C-terminus to the N-terminus 
B)  from the middle toward both the ends 
C)  from the N-terminus to the C-terminus 
D)  The direction varies from one protein to another. 
A)  from the C-terminus to the N-terminus 
B)  from the middle toward both the ends 
C)  from the N-terminus to the C-terminus 
D)  The direction varies from one protein to another.

Question 16

Which of the following dipeptides is alanylserine?

Accepted Answer

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

Question 17

Which of the following dipeptides is alanylglycine?

Accepted Answer

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

Question 18

At which pH does a protein have a net positive charge?

Accepted Answer

A)  at its isoelectric point 
B)  never 
C)  at the pH above its isoelectric point 
D)  at the pH below its isoelectric point 
A)  at its isoelectric point 
B)  never 
C)  at the pH above its isoelectric point 
D)  at the pH below its isoelectric point

Question 19

Which of the following contains a disulfide bond?

Accepted Answer

A)  alanine 
B)  cysteine 
C)  cystine 
D)  methionine 
A)  alanine 
B)  cysteine 
C)  cystine 
D)  methionine

Question 20

Which phenomenon is exhibited during the binding of oxygen to hemoglobin?

Accepted Answer

A)  negative cooperativity 
B)  metallic interaction 
C)  positive cooperativity 
D)  hydrophobic interaction 
A)  negative cooperativity 
B)  metallic interaction 
C)  positive cooperativity 
D)  hydrophobic interaction

Exam 21: Proteins

Which of the following proteins has a predominant β-pleated sheet structure?

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

What is the shape of the oxygen-binding curve of myoglobin?

Identify a statement that is true of the functions of proteins.

How many different tripeptides can be made from 20 amino acids?

Consider the given image. What type of interaction is depicted by the dotted line in the given image?

What determines the functions of amino acids?

What type of chemical reaction is involved in the formation of cystine from cysteine?

Which of the following is not a fibrous protein?

Identify the correct naming convention followed while naming a protein or polypeptide.

Which of the following proteins contains a prosthetic group?

How does fetal hemoglobin differ from adult hemoglobin?

Which of the following statements is true of the polarity of proteins?

Which of the following statements is true of all amino acids?

What is the direction of protein synthesis?

Which of the following dipeptides is alanylserine?

Which of the following dipeptides is alanylglycine?

At which pH does a protein have a net positive charge?

Which of the following contains a disulfide bond?

Which phenomenon is exhibited during the binding of oxygen to hemoglobin?

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