Question 1

S-Adenosylmethionine carries _______________groups.

Accepted Answer

A)   methyl
B)   CO2
C)   ammonia
D)   formyl
E)   None of the answers is correct.F) A) and E)
G) A) and C)

Question 2

The _______________ reaction establishes the stereochemistry at the α-carbon atom in amino acids.

Accepted Answer

The answer of The _______________ reaction establishes the stereochemistry at...

Question 3

Although nitrogen is abundant in the form of atmospheric nitrogen,it presents a fundamental problem for use in biological systems.What is the problem,and how is it resolved?

Accepted Answer

N₂ is a remarkably inert molecule and so ...

Question 4

The enzyme _______________ is regulated by cumulative feedback inhibition.

Accepted Answer

glutamine ...

Question 5

Describe the regulation of the enzyme threonine deaminase.

Accepted Answer

This enzyme is inhibited by isoleucine,a...

Question 6

The peptide glutathione

Accepted Answer

A)   has a glutamate residue linked to glycine through its α-amine.
B)   plays a role in the synthesis of the purine guanine.
C)   is required to catalyze the transamination of glutamate from α-ketoglutarate.
D)   is used to detoxify cells by reacting with organic peroxides.
E)   functions as a one-carbon transfer molecule.F) A) and B)
G) A) and C)

Question 7

What vitamin is the precursor for methylcobalamin?

Accepted Answer

A)   B2
B)   B6
C)   B7
D)   B9
E)   B12F) D) and E)
G) C) and D)

Question 8

What common biochemical strategy allows ammonia to be generated for use within the same enzyme?

Accepted Answer

A)   ammonia fixation
B)   glutamine hydrolysis
C)   ammonia activation
D)   glutamate hydrolysis
E)   None of the answers is correct.F) C) and E)
G) B) and C)

Question 9

What caused the "madness" of King George III?

Accepted Answer

It is believed that he suffered from a p...

Question 10

The enzyme _______________ contains a selenium analogue of cysteine.

Accepted Answer

glutathion...

Question 11

Methyl,methylene,and _______________ units can be carried by tetrahydrofolate.

Accepted Answer

The answer of Methyl,methylene,and _______________ units can be carried by...

Question 12

Tyrosine is a precursor to the molecule(s)

Accepted Answer

A)   melanin.
B)   epinephrine.
C)   serotonin.
D)   melanin and epinephrine
E)   melanin and serotonin.F) A) and B)
G) B) and C)

Question 13

At least _____________ ATP molecules are hydrolyzed for each N2 reduced.

Accepted Answer

Question 14

Glutamate is the carbon skeleton precursor for the amino acids glutamine,proline,and ______________.

Accepted Answer

The answer of Glutamate is the carbon skeleton precursor for...

Question 15

The protein ________________stores iron,whereas the protein transferrin transports it.

Accepted Answer

The answer of The protein ________________stores iron,whereas the protein transferrin...

Question 16

Nitric oxide

Accepted Answer

A)   is a short-lived signal molecule.
B)   is generated by the oxidation of lysine.
C)   requires NADP+ and O2 for synthesis.
D)   is metabolized be reaction with ornithine.
E)   All of the answers are correct.F) All of the above
G) None of the above

Question 17

The α-amino group found in most amino acids comes from _______________by a transamination reaction.

Accepted Answer

The answer of The α-amino group found in most amino...

Question 18

Homocysteine is an intermediate in the synthesis of cysteine and _______________.

Accepted Answer

The answer of Homocysteine is an intermediate in the synthesis...

Question 19

Glycine condenses with succinyl CoA in the first step of ____________ synthesis.

Accepted Answer

A)   thiamine
B)   histamine
C)   glutathione
D)   porphyrin
E)   folateF) C) and D)
G) C) and E)

Question 20

The ATP-binding region of the nitrogen-fixating reductase is a(n) ___________ domain.

Accepted Answer

A)   iron-sulfur
B)   electron-binding
C)   P-loop NTPase family
D)   molybdenum-binding
E)   All the answers are correct.F) D) and E)
G) B) and C)

Exam 24: The Biosynthesis of Amino Acids

S-Adenosylmethionine carries _______________groups.

Correct AnswerverifiedShow Answer

The enzyme _______________ is regulated by cumulative feedback inhibition.

Correct Answerverifiedglutamine ...View AnswerShow Answer

Nitric oxide

Correct AnswerverifiedShow Answer

Describe the regulation of the enzyme threonine deaminase.

Correct AnswerverifiedThis enzyme is inhibited by isoleucine,a...View AnswerShow Answer

Although nitrogen is abundant in the form of atmospheric nitrogen,it presents a fundamental problem for use in biological systems.What is the problem,and how is it resolved?

Correct AnswerverifiedN2 is a remarkably inert molecule and so ...View AnswerShow Answer

What caused the "madness" of King George III?

Correct AnswerverifiedIt is believed that he suffered from a p...View AnswerShow Answer

Methyl,methylene,and _______________ units can be carried by tetrahydrofolate.

Correct AnswerverifiedShow Answer

The _______________ reaction establishes the stereochemistry at the α-carbon atom in amino acids.

Correct AnswerverifiedShow Answer

The peptide glutathione

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The protein ________________stores iron,whereas the protein transferrin transports it.

Correct AnswerverifiedShow Answer

What vitamin is the precursor for methylcobalamin?

Correct AnswerverifiedShow Answer

Glutamate is the carbon skeleton precursor for the amino acids glutamine,proline,and ______________.

Correct AnswerverifiedShow Answer

What common biochemical strategy allows ammonia to be generated for use within the same enzyme?

Correct AnswerverifiedShow Answer

The enzyme _______________ contains a selenium analogue of cysteine.

Correct Answerverifiedglutathion...View AnswerShow Answer

Glycine condenses with succinyl CoA in the first step of ____________ synthesis.

Correct AnswerverifiedShow Answer

Tyrosine is a precursor to the molecule(s)

Correct AnswerverifiedShow Answer

The ATP-binding region of the nitrogen-fixating reductase is a(n) ___________ domain.

Correct AnswerverifiedShow Answer

The α-amino group found in most amino acids comes from _______________by a transamination reaction.

Correct AnswerverifiedShow Answer

At least _____________ ATP molecules are hydrolyzed for each N2 reduced.

Correct AnswerverifiedShow Answer

Homocysteine is an intermediate in the synthesis of cysteine and _______________.

Correct AnswerverifiedShow Answer

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glutamine ...
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This enzyme is inhibited by isoleucine,a...
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N₂ is a remarkably inert molecule and so ...
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It is believed that he suffered from a p...
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glutathion...
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At least _____________ ATP molecules are hydrolyzed for each N₂ reduced.

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Correct Answer
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