Question 1

Describe the structure and function of the FeMo cofactor.

Accepted Answer

This unusual redox center is the site of...

Question 2

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

Accepted Answer

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

Question 3

S-Adenosylmethionine carries _______________groups.

Accepted Answer

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

Question 4

What is catalytic substrate channeling?

Accepted Answer

Channeling increases the catalytic rate,...

Question 5

What unusual (and not recommended) experiments were carried out by Shemin and colleagues?

Accepted Answer

Acting as a human guinea pig, ...

Question 6

What caused the "madness" of King George III?

Accepted Answer

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

Question 7

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

Accepted Answer

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

Question 8

An example of a reaction controlled by enzyme multiplicity is

Accepted Answer

A)   phosphorylation of asparagine by aspartokinases.
B)   phosphorylation of aspartate by aspartokinases.
C)   phosphorylation of glutamine by glutamine synthetase.
D)   all of the above.
E)   None of the answers is correct.F) B) and C)
G) C) and E)

Question 9

Which of the following is the original nitrogen source for the nitrogen found in amino acids?

Accepted Answer

A)   atmospheric nitrogen (N2) 
B)   tetrahydrofolate
C)   glutamine
D)   ammonia (NH3) 
E)   ureaF) None of the above
G) A) and C)

Question 10

What is the advantage of the enzymatic cascade for the regulation of glutamine synthetase activity?

Accepted Answer

This allows fine-tuning and am...

Question 11

Essential amino acids (for humans)  differ from nonessential amino acids in that

Accepted Answer

A)   nonessential amino acids are synthesized in simple reaction pathways compared to complex pathways for most essential amino acids.
B)   essential amino acids are generally synthesized directly from citric acid cycle intermediates, but not nonessential amino acids.
C)   microorganisms and animals cannot synthesize essential amino acids but plants can.
D)   animals cannot synthesize essential amino acids because they have lost the ability to carry out transamination reactions.
E)   All of the answers are correct.F) B) and D)
G) C) and D)

Question 12

Which of the following is a versatile carrier of several different one-carbon units?

Accepted Answer

A)   pyridoxal phosphate
B)   biotin
C)   tetrahydrofolate
D)   coenzyme A
E)   None of the answers is correct.F) A) and D)
G) A) and E)

Question 13

This amino acid, in high levels, is correlated with the damage of cells lining the blood vessels.

Accepted Answer

A)   serine
B)   cysteine
C)   S-adenosylmethionine
D)   citrulline
E)   homocysteineF) A) and E)
G) C) and D)

Question 14

Organisms capable of carrying out reduction of atmospheric nitrogen include

Accepted Answer

A)   some bacteria and archaea.
B)   higher eukaryotic organisms, such as mammals.
C)   all plants.
D)   fungi, including yeasts and molds.
E)   None of the answers is correct.F) B) and D)
G) C) and D)

Question 15

Describe the regulation of the enzyme threonine deaminase.

Accepted Answer

This enzyme is inhibited by isoleucine, ...

Question 16

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 17

The enzyme _______________ is regulated by cumulative feedback inhibition.

Accepted Answer

glutamine ...

Question 18

The carbon skeletons used to synthesize amino acids are intermediates found in

Accepted Answer

A)   glycolysis.
B)   glycogen metabolism.
C)   citric acid cycle.
D)   All the answers are correct.
E)   glycolysis and citric acid cycleF) None of the above
G) C) and D)

Question 19

Draw homocysteine.

Accepted Answer

The molecu...

Question 20

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...

Exam 24: The Biosynthesis of Amino Acids

The carbon skeletons used to synthesize amino acids are intermediates found in

Correct AnswerverifiedShow Answer

Which of the following is the original nitrogen source for the nitrogen found in amino acids?

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Which of the following is a versatile carrier of several different one-carbon units?

Correct AnswerverifiedShow Answer

What is the advantage of the enzymatic cascade for the regulation of glutamine synthetase activity?

Correct AnswerverifiedThis allows fine-tuning and am...View AnswerShow Answer

The enzyme _______________ is regulated by cumulative feedback inhibition.

Correct Answerverifiedglutamine ...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

What caused the "madness" of King George III?

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

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

Correct AnswerverifiedShow Answer

Describe the structure and function of the FeMo cofactor.

Correct AnswerverifiedThis unusual redox center is the site of...View AnswerShow Answer

S-Adenosylmethionine carries _______________groups.

Correct AnswerverifiedShow Answer

What unusual (and not recommended) experiments were carried out by Shemin and colleagues?

Correct AnswerverifiedActing as a human guinea pig, ...View AnswerShow Answer

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

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What is catalytic substrate channeling?

Correct AnswerverifiedChanneling increases the catalytic rate,...View AnswerShow Answer

Organisms capable of carrying out reduction of atmospheric nitrogen include

Correct AnswerverifiedShow Answer

Describe the regulation of the enzyme threonine deaminase.

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

Draw homocysteine.

Correct AnswerverifiedThe molecu...View AnswerShow Answer

Essential amino acids (for humans) differ from nonessential amino acids in that

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

An example of a reaction controlled by enzyme multiplicity is

Correct AnswerverifiedShow Answer

This amino acid, in high levels, is correlated with the damage of cells lining the blood vessels.

Correct AnswerverifiedShow Answer

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This allows fine-tuning and am...
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glutamine ...
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It is believed that he suffered from a p...
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This unusual redox center is the site of...
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Acting as a human guinea pig, ...
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Channeling increases the catalytic rate,...
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This enzyme is inhibited by isoleucine, ...
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The molecu...
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