Question 1

When the peptide below is hydrolyzed with water,the products are the amino acids proline,cysteine,and glutamine.

Accepted Answer

A) True 
 B)False

Question 2

Which is an example of a globular protein?

Accepted Answer

A)  Collagen
B)  α-keratin
C)  Hemoglobin
D)  AmylopectinE) B) and D)
F) B) and C)

Question 3

Which statement is not true?

Accepted Answer

A)  A cofactor is always a metal ion needed for an enzyme-catalyzed reaction to occur.
B)  The names of most enzymes end in the suffix -ase.
C)  An enzyme-catalyzed reaction can be 106 to 1012 times faster than a similar uncatalyzed reaction.
D)  Enzymes are proteins that serve as biological catalysts for reactions in all living organisms.E) C) and D)
F) None of the above

Question 4

What is the strongest type of interaction between the side chains of an isoleucine amino acid and a phenylalanine amino acid in a protein?

Accepted Answer

A)  Hydrogen bonding
B)  London dispersion forces
C)  Disulfide bond
D)  Electrostatic interactionsE) A) and C)
F) B) and C)

Question 5

What type of intermolecular forces exist between the side chains of isoleucine and valine?

Accepted Answer

A)  Electrostatic attraction
B)  London dispersion forces
C)  Hydrogen bond
D)  Disulfide bondE) B) and D)
F) A) and C)

Question 6

HIV protease inhibitors are used to treat HIV by binding to an enzyme needed by the virus to replicate itself.

Accepted Answer

A) True 
 B)False

Question 7

The hydrolysis of the amide bonds in a protein forms the individual amino acids that comprise the primary structure.

Accepted Answer

A) True 
 B)False

Question 8

The enzyme in the ribbon diagram shown is composed primarily of β-pleated sheets.

Accepted Answer

A) True 
 B)False

Question 9

Which protein stores iron in the liver?

Accepted Answer

A)  Ferritin
B)  Keratin
C)  Myoglobin
D)  CollagenE) B) and C)
F) All of the above

Question 10

The "cartoon" shown is an example of noncompetitive inhibition.

Accepted Answer

A) True 
 B)False

Question 11

A reversible inhibitor does which of the following?

Accepted Answer

A)  It covalently binds to an enzyme,permanently destroying its activity.
B)  It binds to the enzyme,but does not bind at the active side.
C)  It binds to an enzyme but then enzyme activity is restored when the inhibitor is released.
D)  It has a shape and structure similar to the substrate,so it competes with the substrate for binding to the active side.E) C) and D)
F) A) and B)

Question 12

Which is the simplest amino acid?

Accepted Answer

A)  Serine
B)  Glutamine
C)  Cysteine
D)  GlycineE) B) and D)
F) A) and B)

Question 13

What is the three-letter abbreviation of asparagine?

Accepted Answer

A)  Asp
B)  Asg
C)  Asn
D)  ArgE) All of the above
F) A) and C)

Question 14

By convention,the C-terminal amino acid is always written at the right end of the peptide chain and the N-terminal amino acid at the left.

Accepted Answer

A) True 
 B)False

Question 15

The term protein is usually reserved for polymers of more than ________ amino acids.

Accepted Answer

A)  10
B)  40
C)  200
D)  1000E) B) and D)
F) A) and B)

Question 16

What is the name of the amino acid shown below?

Accepted Answer

A)  L-cysteine
B)  D-cysteine
C)  L-serine
D)  D-serineE) B) and C)
F) A) and D)

Question 17

What is the structure of the amino acid phenylalanine at pH 1?

Accepted Answer

A)   
B)   
C)   
D)   E) A) and B)
F) A) and C)

Question 18

Insulin is a small protein consisting of two polypeptide chains held together by hydrogen bonds.

Accepted Answer

A) True 
 B)False

Exam 21: Amino Acids,proteins,and Enzymes

A reversible inhibitor does which of the following?

Correct Answer
verified

The hydrolysis of the amide bonds in a protein forms the individual amino acids that comprise the primary structure.

Correct Answer
verified

HIV protease inhibitors are used to treat HIV by binding to an enzyme needed by the virus to replicate itself.

Correct Answer
verified

Which protein stores iron in the liver?

Correct Answer
verified

The term protein is usually reserved for polymers of more than ________ amino acids.

Correct Answer
verified

What is the name of the amino acid shown below?

Correct Answer
verified

By convention,the C-terminal amino acid is always written at the right end of the peptide chain and the N-terminal amino acid at the left.

Correct Answer
verified

The enzyme in the ribbon diagram shown is composed primarily of β-pleated sheets.

Correct Answer
verified

Which is an example of a globular protein?

Correct Answer
verified

The "cartoon" shown is an example of noncompetitive inhibition.

Correct Answer
verified

What is the structure of the amino acid phenylalanine at pH 1?

Correct Answer
verified

Which is the simplest amino acid?

Correct Answer
verified

What is the three-letter abbreviation of asparagine?

Correct Answer
verified

What is the strongest type of interaction between the side chains of an isoleucine amino acid and a phenylalanine amino acid in a protein?

Correct Answer
verified

Insulin is a small protein consisting of two polypeptide chains held together by hydrogen bonds.

Correct Answer
verified

When the peptide below is hydrolyzed with water,the products are the amino acids proline,cysteine,and glutamine.

Correct Answer
verified

Which statement is not true?

Correct Answer
verified

What type of intermolecular forces exist between the side chains of isoleucine and valine?

Correct Answer
verified

Exam 21: Amino Acids,proteins,and Enzymes

A reversible inhibitor does which of the following?

Correct AnswerverifiedShow Answer

The hydrolysis of the amide bonds in a protein forms the individual amino acids that comprise the primary structure.

Correct AnswerverifiedShow Answer

HIV protease inhibitors are used to treat HIV by binding to an enzyme needed by the virus to replicate itself.

Correct AnswerverifiedShow Answer

Which protein stores iron in the liver?

Correct AnswerverifiedShow Answer

The term protein is usually reserved for polymers of more than ________ amino acids.

Correct AnswerverifiedShow Answer

What is the name of the amino acid shown below?

Correct AnswerverifiedShow Answer

By convention,the C-terminal amino acid is always written at the right end of the peptide chain and the N-terminal amino acid at the left.

Correct AnswerverifiedShow Answer

The enzyme in the ribbon diagram shown is composed primarily of β-pleated sheets.

Correct AnswerverifiedShow Answer

Which is an example of a globular protein?

Correct AnswerverifiedShow Answer

The "cartoon" shown is an example of noncompetitive inhibition.

Correct AnswerverifiedShow Answer

What is the structure of the amino acid phenylalanine at pH 1?

Correct AnswerverifiedShow Answer

Which is the simplest amino acid?

Correct AnswerverifiedShow Answer

What is the three-letter abbreviation of asparagine?

Correct AnswerverifiedShow Answer

What is the strongest type of interaction between the side chains of an isoleucine amino acid and a phenylalanine amino acid in a protein?

Correct AnswerverifiedShow Answer

Insulin is a small protein consisting of two polypeptide chains held together by hydrogen bonds.

Correct AnswerverifiedShow Answer

When the peptide below is hydrolyzed with water,the products are the amino acids proline,cysteine,and glutamine.

Correct AnswerverifiedShow Answer

Which statement is not true?

Correct AnswerverifiedShow Answer

What type of intermolecular forces exist between the side chains of isoleucine and valine?

Correct AnswerverifiedShow Answer

Correct Answer
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