Question 1

What is enzyme multiplicity?

Accepted Answer

This is a strategy for regulation in whi...

Question 2

Erythrose 4-phosphate is a precursor to the amino acids:

Accepted Answer

A)   tryptophan, tyrosine, and phenylalanine.
B)   tryptophan and phenylalanine.
C)   tyrosine and phenylalanine.
D)   tryptophan, tyrosine, phenylalanine, and serine.
E)   None of the above.F) All of the above
G) A) and B) A

Question 3

Choose the correct answer from the list below. Not all of the answers will be used.
-Methylcobalamine is derived from vitamin _______________.

Accepted Answer

A)  atmospheric nitrogen (N2) 
B)  3-phosphoglycerate
C)  cumulative
D)  nitrogen fixation
E)  B12F) histidineG) tetrahydrofolateH) committedI) pyridoxal phosphateJ) enzyme multiplicityK) MoFe cofactorL) ammonia (NH3) M) I) and L)
N) B) and J)

Question 4

The rates of synthesis of amino acid metabolic pathways often depends on the:

Accepted Answer

A)   committed step.
B)   allosteric regulation.
C)   feedback inhibition.
D)   All of the above.
E)   None of the above.F) A) and E)
G) A) and D)

Question 5

Glutamine synthetase adds NH3 to __________________ to make glutamine.

Accepted Answer

Question 6

What is a major difference between the amino acid biosynthetic capacity of prokaryotic organisms and humans?

Accepted Answer

Whereas microorganisms can make most of ...

Question 7

Essential amino acids differ from nonessential amino acids in that:

Accepted Answer

A)   nonessential amino acids are synthesized in simple reactions compared to many for most essential amino acids.
B)   essential amino acids are generally synthesized directly from citric acid cycle intermediates, but nonessential amino acids are not.
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)   None of the above.F) A) and D)
G) A) and C)

Question 8

Metabolic pathways that have alternate products are often regulated by __________________and ____________.

Accepted Answer

feedback i...

Question 9

Only a few prokaryotes, such as __________________, are able convert N2 to ammonia.

Accepted Answer

nitrogen-f...

Question 10

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

Accepted Answer

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

Question 11

Describe the effect of cumulative inhibition.

Accepted Answer

This describes a situation in which seve...

Question 12

Which gaseous plant hormone is involved in triggering ripening?

Accepted Answer

A)   melanin
B)   epinephrine
C)   ethylene
D)   A and B
E)   A and CF) C) and D)
G) D) and E)

Question 13

What is significant about many of the intermediates in amino acid biosynthesis?

Accepted Answer

Many of the biosynthetic intermediates c...

Question 14

What determines the range of one-carbon units carried by tetrahydrofolate?

Accepted Answer

One-carbon units bind to the pteridine r...

Question 15

Glutamate is the precursor for the amino acids glutamine, proline, and __________________.

Accepted Answer

arginine

Question 16

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

Accepted Answer

The answer of Methyl, methylene, and __________________ units can be...

Question 17

Choose the correct answer from the list below. Not all of the answers will be used.
-_______________ is a cofactor for transamination reactions.

Accepted Answer

A)  atmospheric nitrogen (N2) 
B)  3-phosphoglycerate
C)  cumulative
D)  nitrogen fixation
E)  B12F) histidineG) tetrahydrofolateH) committedI) pyridoxal phosphateJ) enzyme multiplicityK) MoFe cofactorL) ammonia (NH3) M) D) and H)
N) F) and J)

Question 18

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 above.F) A) and E)
G) A) and D)

Question 19

Which amino acid is added to indole to form tryptophan?

Accepted Answer

A)   glutamine
B)   serine
C)   tyrosine
D)   All of the above.
E)   None of the above.F) None of the above
G) B) and E) B

Question 20

Choose the correct answer from the list below. Not all of the answers will be used.
-_______________ is the site of nitrogen fixation by nitrogenase enzymes.

Accepted Answer

A)  atmospheric nitrogen (N2) 
B)  3-phosphoglycerate
C)  cumulative
D)  nitrogen fixation
E)  B12F) histidineG) tetrahydrofolateH) committedI) pyridoxal phosphateJ) enzyme multiplicityK) MoFe cofactorL) ammonia (NH3) M) D) and I)
N) A) and L)

Exam 31: Amino Acids Synthesis

What is enzyme multiplicity?

Correct AnswerverifiedThis is a strategy for regulation in whi...View AnswerShow Answer

Erythrose 4-phosphate is a precursor to the amino acids:

Correct AnswerverifiedA

Choose the correct answer from the list below. Not all of the answers will be used. -Methylcobalamine is derived from vitamin _______________.

Correct AnswerverifiedShow Answer

The rates of synthesis of amino acid metabolic pathways often depends on the:

Correct AnswerverifiedShow Answer

Glutamine synthetase adds NH3 to __________________ to make glutamine.

Correct AnswerverifiedShow Answer

What is a major difference between the amino acid biosynthetic capacity of prokaryotic organisms and humans?

Correct AnswerverifiedWhereas microorganisms can make most of ...View AnswerShow Answer

Essential amino acids differ from nonessential amino acids in that:

Correct AnswerverifiedShow Answer

Metabolic pathways that have alternate products are often regulated by __________________and ____________.

Correct Answerverifiedfeedback i...View AnswerShow Answer

Only a few prokaryotes, such as __________________, are able convert N2 to ammonia.

Correct Answerverifiednitrogen-f...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

Describe the effect of cumulative inhibition.

Correct AnswerverifiedThis describes a situation in which seve...View AnswerShow Answer

Which gaseous plant hormone is involved in triggering ripening?

Correct AnswerverifiedShow Answer

What is significant about many of the intermediates in amino acid biosynthesis?

Correct AnswerverifiedMany of the biosynthetic intermediates c...View AnswerShow Answer

What determines the range of one-carbon units carried by tetrahydrofolate?

Correct AnswerverifiedOne-carbon units bind to the pteridine r...View AnswerShow Answer

Glutamate is the precursor for the amino acids glutamine, proline, and __________________.

Correct Answerverifiedarginine

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

Correct AnswerverifiedShow Answer

Choose the correct answer from the list below. Not all of the answers will be used. -_______________ is a cofactor for transamination reactions.

Correct AnswerverifiedShow Answer

An example of a reaction controlled by enzyme multiplicity is:

Correct AnswerverifiedShow Answer

Which amino acid is added to indole to form tryptophan?

Correct AnswerverifiedB

Choose the correct answer from the list below. Not all of the answers will be used. -_______________ is the site of nitrogen fixation by nitrogenase enzymes.

Correct AnswerverifiedShow Answer

Correct Answer
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This is a strategy for regulation in whi...
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A

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Glutamine synthetase adds NH₃ to __________________ to make glutamine.

Correct Answer
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Whereas microorganisms can make most of ...
View Answer

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Metabolic pathways that have alternate products are often regulated by ______and .

Correct Answer
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feedback i...
View Answer

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nitrogen-f...
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This describes a situation in which seve...
View Answer

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Many of the biosynthetic intermediates c...
View Answer

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One-carbon units bind to the pteridine r...
View Answer

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arginine

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B

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