Question 1

What is the N-terminal amino acid in the tetrapeptide glycylalanyisoleucylmethionine?

Accepted Answer

A)  Alanine
B)  Glycine
C)  Methionine
D)  IsoleucineE) None of the above
F) A) and C)

Question 2

Proteins are long chains of amino acids joined together by peptide bonds. Which structure properly depicts the peptide bond formed between two generic amino acids?

Accepted Answer

A)   
B)   
C)   
D)   E) B) and C)
F) All of the above

Question 3

A ________ is a peptide that contains four amino acids joined together by three peptide bonds.

Accepted Answer

The answer of A ________ is a peptide that contains...

Question 4

There are ________ amino acids that occur naturally in proteins.

Accepted Answer

A)  12
B)  15
C)  20
D)  21
E)  30F) C) and D)
G) B) and D)

Question 5

Serine exists primarily in its neutral form at a pH ~ 6.

Accepted Answer

A) True 
 B)False

Question 6

A diet of rice and tofu provides all essential amino acids.

Accepted Answer

A) True 
 B)False

Question 7

What type of intermolecular forces exist between the side chains of glutamic acid and lysine?

Accepted Answer

A)  Electrostatic attraction
B)  London dispersion forces
C)  Hydrogen bond
D)  Disulfide bondE) B) and D)
F) None of the above

Question 8

The amide bonds in peptides and proteins are called peptide bonds.

Accepted Answer

A) True 
 B)False

Question 9

What is the strongest type of interaction between two cysteine amino acid side chains in a protein?

Accepted Answer

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

Question 10

What is the C-terminal amino acid in the tetrapeptide glycylalanyisoleucylmethionine?

Accepted Answer

A)  Alanine
B)  Glycine
C)  Methionine
D)  IsoleucineE) B) and D)
F) None of the above

Question 11

D-Amino acids have the -NH3+ group on the left side in the Fischer projection.

Accepted Answer

A) True 
 B)False

Question 12

Denaturation of a protein results in the loss of its native conformation and its biological activity. Which statement best describes what happens to a protein when it is denatured?

Accepted Answer

A)  Peptide bonds are broken.
B)  New amino acids are joined to the peptide backbone.
C)  Secondary,tertiary,and quaternary levels of structure are disrupted.
D)  The N-terminal and C-terminal ends of the protein are hydrolyzed by enzymes.E) B) and C)
F) C) and D)

Question 13

No one plant source has sufficient amounts of all of the essential amino acids.

Accepted Answer

A) True 
 B)False

Question 14

Which choice is the unique structural feature of collagen?

Accepted Answer

A)  α-coil
B)  β-sheet
C)  Disulfide linkage
D)  Triple helixE) A) and B)
F) A) and C)

Question 15

Hydrogen bonding is possible between the side chains of the amino acids tyrosine and threonine.

Accepted Answer

A) True 
 B)False

Question 16

Which amino acid is a basic amino acid?

Accepted Answer

A)  Serine
B)  Arginine
C)  Cysteine
D)  AlanineE) None of the above
F) C) and D)

Question 17

Which statement about oxytocin and vasopressin is not true?

Accepted Answer

A)  Oxytocin and vasopressin each contain nine amino acids.
B)  Oxytocin and vasopressin each contain cysteine on both sides of a disulfide bond.
C)  Oxytocin and vasopressin each contain a single disulfide bond.
D)  Oxytocin and vasopressin each contain cysteine as the C-terminal amino acid.E) C) and D)
F) All of the above

Question 18

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

Accepted Answer

A) True 
 B)False

Question 19

The difference between normal hemoglobin and sickle cell hemoglobin is that a single amino acid of both β subunits is changed from glutamic acid to ________.

Accepted Answer

The answer of The difference between normal hemoglobin and sickle...

Question 20

Which conditions are commonly diagnosed by measuring the levels of specific enzymes in the blood?

Accepted Answer

A)  Heart attack
B)  High blood pressure
C)  Pregnancy
D)  MigrainesE) A) and B)
F) None of the above

Exam 21: Amino Acids,proteins,and Enzymes

The amide bonds in peptides and proteins are called peptide bonds.

Correct AnswerverifiedShow Answer

There are ________ amino acids that occur naturally in proteins.

Correct AnswerverifiedShow Answer

A diet of rice and tofu provides all essential amino acids.

Correct AnswerverifiedShow Answer

What is the C-terminal amino acid in the tetrapeptide glycylalanyisoleucylmethionine?

Correct AnswerverifiedShow Answer

Which statement about oxytocin and vasopressin is not true?

Correct AnswerverifiedShow Answer

What type of intermolecular forces exist between the side chains of glutamic acid and lysine?

Correct AnswerverifiedShow Answer

What is the strongest type of interaction between two cysteine amino acid side chains in a protein?

Correct AnswerverifiedShow Answer

Serine exists primarily in its neutral form at a pH ~ 6.

Correct AnswerverifiedShow Answer

D-Amino acids have the -NH3+ group on the left side in the Fischer projection.

Correct AnswerverifiedShow Answer

Which choice is the unique structural feature of collagen?

Correct AnswerverifiedShow Answer

No one plant source has sufficient amounts of all of the essential amino acids.

Correct AnswerverifiedShow Answer

Denaturation of a protein results in the loss of its native conformation and its biological activity. Which statement best describes what happens to a protein when it is denatured?

Correct AnswerverifiedShow Answer

Proteins are long chains of amino acids joined together by peptide bonds. Which structure properly depicts the peptide bond formed between two generic amino acids?

Correct AnswerverifiedShow Answer

A ________ is a peptide that contains four amino acids joined together by three peptide bonds.

Correct AnswerverifiedShow Answer

Hydrogen bonding is possible between the side chains of the amino acids tyrosine and threonine.

Correct AnswerverifiedShow Answer

What is the N-terminal amino acid in the tetrapeptide glycylalanyisoleucylmethionine?

Correct AnswerverifiedShow Answer

Which amino acid is a basic amino acid?

Correct AnswerverifiedShow Answer

Which conditions are commonly diagnosed by measuring the levels of specific enzymes in the blood?

Correct AnswerverifiedShow Answer

The difference between normal hemoglobin and sickle cell hemoglobin is that a single amino acid of both β subunits is changed from glutamic acid to ________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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D-Amino acids have the -NH₃⁺ group on the left side in the Fischer projection.

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