Question 1

Which of the following pair of amino acids can form hydrogen bonds?

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 2

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

Accepted Answer

A)  arginine 
B)  alanine 
C)  leucine 
D)  tyrosine 
A)  arginine 
B)  alanine 
C)  leucine 
D)  tyrosine

Question 3

Which of the following pair of amino acids can form a salt bridge?

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 4

Which amino acid can be found in proteins in both its protonated and unprotonated forms?

Accepted Answer

A)  alanine 
B)  glycine 
C)  histidine 
D)  phenylalanine 
A)  alanine 
B)  glycine 
C)  histidine 
D)  phenylalanine

Question 5

Which of the following amino acid side chains is hydrophobic?

Accepted Answer

A)  acidic 
B)  nonpolar 
C)  polar but neutral 
D)  none of these 
A)  acidic 
B)  nonpolar 
C)  polar but neutral 
D)  none of these

Question 6

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

Accepted Answer

A)  alanine 
B)  glycine 
C)  valine 
D)  lysine 
A)  alanine 
B)  glycine 
C)  valine 
D)  lysine

Question 7

Which of the following interactions is not associated with the stabilization of the tertiary structure of a protein?

Accepted Answer

A)  covalent bonding 
B)  hydrogen bonding 
C)  hydrophobic interactions 
D)  None, they are all associated with the tertiary structure. 
A)  covalent bonding 
B)  hydrogen bonding 
C)  hydrophobic interactions 
D)  None, they are all associated with the tertiary structure.

Question 8

Which protein contains both hydroxylysine and hydroxyproline?

Accepted Answer

A)  actin 
B)  collagen 
C)  fibrinogen 
D)  hemoglobin 
A)  actin 
B)  collagen 
C)  fibrinogen 
D)  hemoglobin

Question 9

Which of the following proteins has a predominant α-helix 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 10

Which of the following diseases is associated with lower-than-normal levels of L-dopa?

Accepted Answer

A)  Alzheimer's disease 
B)  Schizophrenia 
C)  Parkinson's disease 
D)  Bipolar disorder 
A)  Alzheimer's disease 
B)  Schizophrenia 
C)  Parkinson's disease 
D)  Bipolar disorder

Question 11

What is the approximate isoelectric point (pI) of most amino acids?

Accepted Answer

A)  3 
B)  6 
C)  7 
D)  10 
A)  3 
B)  6 
C)  7 
D)  10

Question 12

Which of the following is an achiral amino acid?

Accepted Answer

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

Question 13

Which of the following is a type of secondary structure that is found in proteins?

Accepted Answer

A)  α-pleated sheet 
B)  β-helix 
C)  both α-pleated sheet and β-helix 
D)  neither α-pleated sheet nor β-helix 
A)  α-pleated sheet 
B)  β-helix 
C)  both α-pleated sheet and β-helix 
D)  neither α-pleated sheet nor β-helix

Question 14

What type of chemical reaction is involved in the conversion of cystine to cysteine?

Accepted Answer

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

Question 15

Why is carbon monoxide poisonous in larger quantities?

Accepted Answer

A)  because it enhances the binding of oxygen to the heme group 
B)  because it decreases the synthesis of hemoglobin in the bone marrow 
C)  because it disrupts the final step of the electron transport chain 
D)  because it disrupts the process of gluconeogenesis in the body 
A)  because it enhances the binding of oxygen to the heme group 
B)  because it decreases the synthesis of hemoglobin in the bone marrow 
C)  because it disrupts the final step of the electron transport chain 
D)  because it disrupts the process of gluconeogenesis in the body

Question 16

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 17

Which of the following proteins assists other proteins in attaining their proper secondary and tertiary structures?

Accepted Answer

A)  insulin 
B)  chaperones 
C)  prions 
D)  myosin 
A)  insulin 
B)  chaperones 
C)  prions 
D)  myosin

Question 18

Which of the following amino acids is occasionally found in proteins?

Accepted Answer

A)  asparagine 
B)  hydroxyproline 
C)  proline 
D)  serine 
A)  asparagine 
B)  hydroxyproline 
C)  proline 
D)  serine

Question 19

Which of the following is a structural protein?

Accepted Answer

A)  cellulose 
B)  collagen 
C)  hemoglobin 
D)  insulin 
A)  cellulose 
B)  collagen 
C)  hemoglobin 
D)  insulin

Question 20

Identify the statement that is true of the heme group of hemoglobin.

Accepted Answer

A)  The heme group contains an iron ion in its Fe3+ oxidation state. 
B)  The porphyrin part of the heme group consists of four pyrrole rings. 
C)  The pyrrole rings are linked together to form a tetrahedral structure. 
D)  The iron ion in the heme group has eight coordination sites. 
A)  The heme group contains an iron ion in its Fe3+ oxidation state. 
B)  The porphyrin part of the heme group consists of four pyrrole rings. 
C)  The pyrrole rings are linked together to form a tetrahedral structure. 
D)  The iron ion in the heme group has eight coordination sites.

Exam 21: Proteins

Which of the following pair of amino acids can form hydrogen bonds?

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

Which of the following pair of amino acids can form a salt bridge?

Which amino acid can be found in proteins in both its protonated and unprotonated forms?

Which of the following amino acid side chains is hydrophobic?

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

Which of the following interactions is not associated with the stabilization of the tertiary structure of a protein?

Which protein contains both hydroxylysine and hydroxyproline?

Which of the following proteins has a predominant α-helix structure?

Which of the following diseases is associated with lower-than-normal levels of L-dopa?

What is the approximate isoelectric point (pI) of most amino acids?

Which of the following is an achiral amino acid?

Which of the following is a type of secondary structure that is found in proteins?

What type of chemical reaction is involved in the conversion of cystine to cysteine?

Why is carbon monoxide poisonous in larger quantities?

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

Which of the following proteins assists other proteins in attaining their proper secondary and tertiary structures?

Which of the following amino acids is occasionally found in proteins?

Which of the following is a structural protein?

Identify the statement that is true of the heme group of hemoglobin.

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