Question 1

The molecule _____ which is synthesized from _____, stimulate vasodilation.

Accepted Answer

A)   nitric oxide; arginine
B)   nitrous oxide; arginine
C)   nitric oxide; citrulline
D)   nitrous oxide; citrulline
E)   none of the aboveF) B) and E)
G) B) and D)

Question 2

Which of the following nonessential amino acids is correctly paired with the essential amino acid that is required for its synthesis?

Accepted Answer

A)   Phe: Trp
B)   Cys: Met
C)   Ser: Gly
D)   Asp: Glu
E)   His: GlnF) All of the above
G) None of the above

Question 3

Which of the following are required by nitrogenase to carry out the reduction of nitrogen?

Accepted Answer

A)   an iron-molybdenum cofactor
B)   iron-sulfur centers
C)   a strong reducing agent such as ferredoxin
D)   the absence of oxygen
E)   all of the aboveF) C) and D)
G) A) and B)

Question 4

How many ATP and electrons are required for the reduction of one molecule of nitrogen to two molecules of ammonia in the reaction catalyzed by nitrogenase?

Accepted Answer

A)   8 ATP and 8 electrons
B)   16 ATP and 8 electrons
C)   16 ATP and 16 electrons
D)   8 ATP and 16 electrons
E)   16 ATP and 6 electronsF) A) and C)
G) D) and E)

Question 5

Which of the following amino acids cannot be produced in a plant that has been treated with glyphosate?

Accepted Answer

A)   Cys
B)   Phe
C)   Leu
D)   Arg
E)   ProF) C) and E)
G) A) and B)

Question 6

What amino acid is the precursor for the neurotransmitters epinephrine and norepinephrine?

Accepted Answer

A)   tryptophan
B)   serine
C)   tyrosine
D)   aspartate
E)   glutamateF) A) and D)
G) D) and E)

Question 7

Which of the following correctly describes the general synthesis of purine nucleotides?

Accepted Answer

A)   The basic ring structure, orotate, is synthesized and then linked to PRPP
B)   The basic ring structure, orotate, is synthesized stepwise on PRPP
C)   The basic ring structure, inosine, is synthesized and then linked to PRPP
D)   The basic ring structure, inosine, is synthesized stepwise on PRPP
E)   none of the aboveF) A) and D)
G) B) and E)

Question 8

Given the following reaction, what is the missing product of the net reaction of glutamine synthetase and glutamate synthase?
  α\alphaα  -ketoglutarate + NH4+ + NADPH + ATP  →\rarr→   NADP+ + ADP + Pi + _____

Accepted Answer

A)   aspartate
B)   asparagine
C)   glutamate
D)   glutamine
E)   none of the above F) A) and E)
G) C) and E)

Question 9

What form of the folate coenzyme is required for the conversion of homocysteine to methionine?

Accepted Answer

A)   methyl-tetrahydrofolate
B)   methylene-tetrahydrofolate
C)   methenyl-tetrahydrofolate
D)   formyl-tetrahydrofolate
E)   dihydrofolateF) B) and D)
G) All of the above A

Question 10

What coenzyme is required for the conversion of serine to glycine?

Accepted Answer

A)   pyridoxal phosphate
B)   lipoic acid
C)   tetrahydrofolate
D)   biotin
E)   cobalaminF) B) and D)
G) None of the above

Question 11

The amino acids metabolized by the branched chain keto acid dehydrogenase complex are _____.

Accepted Answer

A)   Val, Leu and Ile
B)   Thr, Val and Pro
C)   Pro, Leu and Met
D)   Ile, Thr and Pro
E)   none of the aboveF) B) and C)
G) A) and E)

Question 12

Based upon the following, what is the net ATP production for the synthesis of one molecule of urea in the urea cycle? Consider that one nitrogen atom comes from glutamate dehydrogenase and the other comes from aspartate.
The conversion of fumarate to oxaloacetate gives 1 NADH (oxaloacetate is transaminated to aspartate) 
Carbamoyl phosphate synthesis requires 2 ATP equivalents
Argininosuccinate synthesis requires 2 ATP equivalents
Glutamate dehydrogenase produces 1 NADH

Accepted Answer

A)   -4 ATP
B)   -1.5 ATP
C)   -1 ATP
D)   +1 ATP
E)   +3 ATPF) A) and E)
G) A) and B)

Question 13

What are the products of the glycine cleavage system?

Accepted Answer

A)   formyl-tetrahydrofolate, ammonia and carbon dioxide
B)   methylene-tetrahydrofolate, ammonia and carbon dioxide
C)   methyl-tetrahydrofolate, ammonia and carbon dioxide
D)   methylene-tetrahydrofolate and carbamoyl phosphate
E)   methyl-tetrahydrofolate and carbamoyl phosphateF) A) and B)
G) A) and C)

Question 14

Which of the following neurotransmitters is correctly paired with the amino acid from which it is synthesized?

Accepted Answer

A)   dopamine: tyrosine
B)     γ\gammaγ  -aminobutyric acid: glutamate
C)   serotonin: tryptophan
D)   epinephrine: tyrosine
E)   all of the above F) A) and B)
G) B) and D)

Question 15

The enzyme _____ is missing in phenylketonuria while _____ is missing in alkaptonuria.

Accepted Answer

A)   tyrosine transaminase; phenylalanine hydroxylase
B)   phenylalanine hydroxylase; p-hydroxy-phenylpyruvate dioxygenase
C)   phenylalanine hydroxylase; homogentisate oxidase
D)   p-hydroxy-phenylpyruvate dioxygenase; homogentisate oxidase
E)   homogentisate oxidase; tyrosine transaminaseF) A) and D)
G) B) and D) C

Question 16

When the transaminase enzyme is in the _____ form, it will only react with _____.

Accepted Answer

A)   pyridoxal;   α\alphaα  -keto acid
B)   pyridoxal;   α\alphaα  -amino acid
C)   pyridoxamine;   α\alphaα  -amino acid
D)   pyridoxal;   β\betaβ  -keto acid
E)   pyridoxamine;   β\betaβ  -amino acid F) A) and C)
G) A) and B)

Question 17

What amino acid is attached to the pyridoxal-5'-phosphate in a typical transaminase?

Accepted Answer

A)   Ser
B)   His
C)   Arg
D)   Gln
E)   LysF) D) and E)
G) C) and E)

Question 18

Threonine is considered both ketogenic and glucogenic because it is converted to _____ and _____.

Accepted Answer

A)   pyruvate; acetyl-CoA
B)   ammonia; acetoacetate
C)   carbamoyl phosphate; acetoacetate
D)   glycine; acetyl-CoA
E)   glycine; glutaryl-CoAF) B) and D)
G) B) and C) D

Question 19

Which of the following amino acids is properly paired with the amino acid from which it is derived?

Accepted Answer

A)   Gln: Asp
B)   Pro: Ala
C)   Arg: Lys
D)   Tyr: Phe
E)   Ser: CysF) B) and C)
G) All of the above

Question 20

What are the products of the following transamination reaction?
  α\alphaα  -ketoglutarate + alanine  _____ + _____

Accepted Answer

A)   aspartate; oxaloacetate
B)   glutamate; oxaloacetate
C)   aspartate; pyruvate
D)   glutamate; pyruvate
E)   none of the above F) All of the above
G) None of the above

Exam 18: Nitrogen Metabolism

The molecule _ which is synthesized from _, stimulate vasodilation.

Correct Answer
verified

Which of the following nonessential amino acids is correctly paired with the essential amino acid that is required for its synthesis?

Correct Answer
verified

Which of the following are required by nitrogenase to carry out the reduction of nitrogen?

Correct Answer
verified

How many ATP and electrons are required for the reduction of one molecule of nitrogen to two molecules of ammonia in the reaction catalyzed by nitrogenase?

Correct Answer
verified

Which of the following amino acids cannot be produced in a plant that has been treated with glyphosate?

Correct Answer
verified

What amino acid is the precursor for the neurotransmitters epinephrine and norepinephrine?

Correct Answer
verified

Which of the following correctly describes the general synthesis of purine nucleotides?

Correct Answer
verified

Given the following reaction, what is the missing product of the net reaction of glutamine synthetase and glutamate synthase? $\alpha$ -ketoglutarate + NH₄⁺ + NADPH + ATP $\rarr$ NADP⁺ + ADP + P_i + _____

Correct Answer
verified

What form of the folate coenzyme is required for the conversion of homocysteine to methionine?

Correct Answer
verified
A

What coenzyme is required for the conversion of serine to glycine?

Correct Answer
verified

The amino acids metabolized by the branched chain keto acid dehydrogenase complex are _____.

Correct Answer
verified

Correct Answer
verified

What are the products of the glycine cleavage system?

Correct Answer
verified

Which of the following neurotransmitters is correctly paired with the amino acid from which it is synthesized?

Correct Answer
verified

The enzyme _ is missing in phenylketonuria while _ is missing in alkaptonuria.

Correct Answer
verified
C

When the transaminase enzyme is in the _ form, it will only react with _.

Correct Answer
verified

What amino acid is attached to the pyridoxal-5'-phosphate in a typical transaminase?

Correct Answer
verified

Threonine is considered both ketogenic and glucogenic because it is converted to _ and _.

Correct Answer
verified
D

Which of the following amino acids is properly paired with the amino acid from which it is derived?

Correct Answer
verified

Correct Answer
verified

Exam 18: Nitrogen Metabolism

The molecule _____ which is synthesized from _____, stimulate vasodilation.

Correct AnswerverifiedShow Answer

Which of the following nonessential amino acids is correctly paired with the essential amino acid that is required for its synthesis?

Correct AnswerverifiedShow Answer

Which of the following are required by nitrogenase to carry out the reduction of nitrogen?

Correct AnswerverifiedShow Answer

How many ATP and electrons are required for the reduction of one molecule of nitrogen to two molecules of ammonia in the reaction catalyzed by nitrogenase?

Correct AnswerverifiedShow Answer

Which of the following amino acids cannot be produced in a plant that has been treated with glyphosate?

Correct AnswerverifiedShow Answer

What amino acid is the precursor for the neurotransmitters epinephrine and norepinephrine?

Correct AnswerverifiedShow Answer

Which of the following correctly describes the general synthesis of purine nucleotides?

Correct AnswerverifiedShow Answer

Given the following reaction, what is the missing product of the net reaction of glutamine synthetase and glutamate synthase? α\alphaα -ketoglutarate + NH4+ + NADPH + ATP →\rarr→ NADP+ + ADP + Pi + _____

Correct AnswerverifiedShow Answer

What form of the folate coenzyme is required for the conversion of homocysteine to methionine?

Correct AnswerverifiedA

What coenzyme is required for the conversion of serine to glycine?

Correct AnswerverifiedShow Answer

The amino acids metabolized by the branched chain keto acid dehydrogenase complex are _____.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What are the products of the glycine cleavage system?

Correct AnswerverifiedShow Answer

Which of the following neurotransmitters is correctly paired with the amino acid from which it is synthesized?

Correct AnswerverifiedShow Answer

The enzyme _____ is missing in phenylketonuria while _____ is missing in alkaptonuria.

Correct AnswerverifiedC

When the transaminase enzyme is in the _____ form, it will only react with _____.

Correct AnswerverifiedShow Answer

What amino acid is attached to the pyridoxal-5'-phosphate in a typical transaminase?

Correct AnswerverifiedShow Answer

Threonine is considered both ketogenic and glucogenic because it is converted to _____ and _____.

Correct AnswerverifiedD

Which of the following amino acids is properly paired with the amino acid from which it is derived?

Correct AnswerverifiedShow Answer

What are the products of the following transamination reaction? α\alphaα -ketoglutarate + alanine _____ + _____

Correct AnswerverifiedShow Answer

The molecule _ which is synthesized from _, stimulate vasodilation.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Given the following reaction, what is the missing product of the net reaction of glutamine synthetase and glutamate synthase? $\alpha$ -ketoglutarate + NH₄⁺ + NADPH + ATP $\rarr$ NADP⁺ + ADP + P_i + _____

Correct Answer
verified

Correct Answer
verified
A

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The enzyme _ is missing in phenylketonuria while _ is missing in alkaptonuria.

Correct Answer
verified
C

When the transaminase enzyme is in the _ form, it will only react with _.

Correct Answer
verified

Correct Answer
verified

Threonine is considered both ketogenic and glucogenic because it is converted to _ and _.

Correct Answer
verified
D

Correct Answer
verified

Correct Answer
verified