Question 1

Which of the following is the reaction for nitric oxide synthase?

Accepted Answer

A)   citrulline + NO + 1.5 NADP+ +  L-arginine + 1.5 NADPH + H+ + 2O2 
B)   L-arginine + 1.5 NADPH + H+ + 2O2   Citrulline + NO + 1.5 NADP+ 
C)   L-arginine + 1.5 NADPH + H+ + 2O2   Dopamine + NO + 1.5 NADP+ 
D)   L-arginine + 1.5 NADP+ + H+ + 2O2   Citrulline + NO + 1.5 NADPH" class="answers-bank-image d-inline" rel="preload" >L-arginine + 1.5 NADPH + H+ + 2O2
B)   L-arginine + 1.5 NADPH + H+ + 2O2  +  L-arginine + 1.5 NADPH + H+ + 2O2 
B)   L-arginine + 1.5 NADPH + H+ + 2O2   Citrulline + NO + 1.5 NADP+ 
C)   L-arginine + 1.5 NADPH + H+ + 2O2   Dopamine + NO + 1.5 NADP+ 
D)   L-arginine + 1.5 NADP+ + H+ + 2O2   Citrulline + NO + 1.5 NADPH" class="answers-bank-image d-inline" rel="preload" >Citrulline + NO + 1.5 NADP+
C)   L-arginine + 1.5 NADPH + H+ + 2O2  +  L-arginine + 1.5 NADPH + H+ + 2O2 
B)   L-arginine + 1.5 NADPH + H+ + 2O2   Citrulline + NO + 1.5 NADP+ 
C)   L-arginine + 1.5 NADPH + H+ + 2O2   Dopamine + NO + 1.5 NADP+ 
D)   L-arginine + 1.5 NADP+ + H+ + 2O2   Citrulline + NO + 1.5 NADPH" class="answers-bank-image d-inline" rel="preload" >Dopamine + NO + 1.5 NADP+
D)   L-arginine + 1.5 NADP+ + H+ + 2O2  +  L-arginine + 1.5 NADPH + H+ + 2O2 
B)   L-arginine + 1.5 NADPH + H+ + 2O2   Citrulline + NO + 1.5 NADP+ 
C)   L-arginine + 1.5 NADPH + H+ + 2O2   Dopamine + NO + 1.5 NADP+ 
D)   L-arginine + 1.5 NADP+ + H+ + 2O2   Citrulline + NO + 1.5 NADPH" class="answers-bank-image d-inline" rel="preload" >Citrulline + NO + 1.5 NADPHE) B) and C)
F) B) and D)

Question 2

Aminotransferase reaction is an example of what kind of kinetics?

Accepted Answer

A)   ternary
B)   ping-pong
C)   cooperative
D)   reversibleE) B) and C)
F) A) and C)

Question 3

Which three enzymes mediate ammonia assimilation?

Accepted Answer

A)   glutamine synthase, glutamate synthetase, glutamate hydrogenase
B)   glutamine synthetase, glutamate synthase, glutamate dehydrogenase
C)   glutamine oxidase, glutamate reductase, glutamate dehydrogenase
D)   glutamine dehydrogenase, glutamate synthase, glutamate oxidaseE) All of the above
F) A) and C)

Question 4

Outline the process of protein degradation by the ubiquitin proteasome pathway.

Accepted Answer

The ubiquitin proteasome pathway takes t...

Question 5

How can the body easily adjust the relative levels of some amino acids using aminotransferases?

Accepted Answer

A)   Add ATP to the cell to produce more amino acids.
B)   Use common intermediates to interconvert between amino acids.
C)   Phosphorylate the amino acids to prevent them from being used.
D)   Remove NADH from the cell to produce more amino acids.E) A) and D)
F) A) and C)

Question 6

Differentiate between proteins being degraded by an ATP-dependent process compared with the ATP-independent process.

Accepted Answer

An ATP-independent process deg...

Question 7

The shikimate pathway can be defined as the pathway that involves the

Accepted Answer

A)   condensation of phosphoenolpyruvate and erythrose-4-phosphate.
B)   synthesis of essential amino acids from pyruvate.
C)   synthesis of essential amino acids from oxaloacetate.
D)   condensation of oxaloacetate and shikimate.E) None of the above
F) A) and B)

Question 8

The process of nitrogen fixation reduces N2 to

Accepted Answer

A)   NAD+.
B)   nitrate.
C)   ammonia.
D)   nitrite.E) A) and D)
F) None of the above

Question 9

What is a possible outcome to the urea cycle if the cell is unable to produce enough aspartate?

Accepted Answer

A)   Flux would be accelerated through the cycle.
B)   There would be a buildup of citrulline.
C)   There would be a buildup of urea.
D)   The cycle would maintain equilibrium.E) A) and C)
F) All of the above

Question 10

How many different forms of pyridoxal phosphate are observed in the aminotransferase reaction?

Accepted Answer

A)   7
B)   6
C)   5
D)   4E) A) and B)
F) None of the above

Question 11

Why does carbamoyl phosphate synthetase I require two equivalents of ATP?

Accepted Answer

The reaction mechanism for carbamoyl pho...

Question 12

Jaundice is indicative of what process working inefficiently?

Accepted Answer

A)   heme synthesis
B)   bilirubin removal from blood
C)   urea synthesis
D)   amino acid degradationE) A) and B)
F) B) and C)

Question 13

For the figure below,summarize the interdependent regulation of glutamine synthetase and glutamine synthetase adenylyltransferase.

Accepted Answer

Covalent modification of glutamine synth...

Question 14

Agricultural fertilizers provide the ground with nitrate and nitrite,but only ammonia can be assimilated by plants.What process converts nitrate and nitrite to ammonia?

Accepted Answer

A)   nitrification
B)   ammonia assimilation
C)   nitrogen fixation
D)   nitrogen assimilationE) A) and C)
F) C) and D)

Question 15

How is the synthetic pathway for nonessential amino acids different than for essential amino acids?

Accepted Answer

The nonessential amino acids have carbon...

Question 16

Which intermediate is shared by the urea cycle and the citric acid cycle?

Accepted Answer

A)   citrulline
B)   argininosuccinate
C)   aspartate
D)   malateE) B) and C)
F) A) and C)

Question 17

What are the six steps of the nitrogenase reaction?

Accepted Answer

(1)Exchange of 2 ADP for 2 ATP with redu...

Question 18

Why do angina patients carry nitroglycerine with them?

Accepted Answer

A)   as a rapid source of NO for blood vessel dilation
B)   as a source of ammonia for muscle relaxation
C)   to inhibit acetylcholine release from neurons
D)   to inhibit cGMP phosphodiesteraseE) None of the above
F) A) and D)

Question 19

A person who has phenylketonuria must avoid which food additive?

Accepted Answer

A)   protein
B)   methanol
C)   aspartame
D)   phenylalanineE) All of the above
F) C) and D)

Question 20

What is the difference between nitrogen fixation and nitrogen assimilation?

Accepted Answer

Nitrogen fixation is carried out by bact...

Exam 17: Amino Acid Metabolism

The shikimate pathway can be defined as the pathway that involves the

Correct AnswerverifiedShow Answer

What is a possible outcome to the urea cycle if the cell is unable to produce enough aspartate?

Correct AnswerverifiedShow Answer

What are the six steps of the nitrogenase reaction?

Correct Answerverified(1)Exchange of 2 ADP for 2 ATP with redu...View AnswerShow Answer

Which of the following is the reaction for nitric oxide synthase?

Correct AnswerverifiedShow Answer

Which intermediate is shared by the urea cycle and the citric acid cycle?

Correct AnswerverifiedShow Answer

Why does carbamoyl phosphate synthetase I require two equivalents of ATP?

Correct AnswerverifiedThe reaction mechanism for carbamoyl pho...View AnswerShow Answer

Aminotransferase reaction is an example of what kind of kinetics?

Correct AnswerverifiedShow Answer

Agricultural fertilizers provide the ground with nitrate and nitrite,but only ammonia can be assimilated by plants.What process converts nitrate and nitrite to ammonia?

Correct AnswerverifiedShow Answer

How many different forms of pyridoxal phosphate are observed in the aminotransferase reaction?

Correct AnswerverifiedShow Answer

Why do angina patients carry nitroglycerine with them?

Correct AnswerverifiedShow Answer

What is the difference between nitrogen fixation and nitrogen assimilation?

Correct AnswerverifiedNitrogen fixation is carried out by bact...View AnswerShow Answer

Jaundice is indicative of what process working inefficiently?

Correct AnswerverifiedShow Answer

Outline the process of protein degradation by the ubiquitin proteasome pathway.

Correct AnswerverifiedThe ubiquitin proteasome pathway takes t...View AnswerShow Answer

Differentiate between proteins being degraded by an ATP-dependent process compared with the ATP-independent process.

Correct AnswerverifiedAn ATP-independent process deg...View AnswerShow Answer

The process of nitrogen fixation reduces N2 to

Correct AnswerverifiedShow Answer

Which three enzymes mediate ammonia assimilation?

Correct AnswerverifiedShow Answer

How is the synthetic pathway for nonessential amino acids different than for essential amino acids?

Correct AnswerverifiedThe nonessential amino acids have carbon...View AnswerShow Answer

How can the body easily adjust the relative levels of some amino acids using aminotransferases?

Correct AnswerverifiedShow Answer

For the figure below,summarize the interdependent regulation of glutamine synthetase and glutamine synthetase adenylyltransferase.

Correct AnswerverifiedCovalent modification of glutamine synth...View AnswerShow Answer

A person who has phenylketonuria must avoid which food additive?

Correct AnswerverifiedShow Answer

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Correct Answer
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Correct Answer
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(1)Exchange of 2 ADP for 2 ATP with redu...
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Correct Answer
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Correct Answer
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Correct Answer
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The reaction mechanism for carbamoyl pho...
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Nitrogen fixation is carried out by bact...
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Correct Answer
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Correct Answer
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The ubiquitin proteasome pathway takes t...
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Correct Answer
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An ATP-independent process deg...
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The process of nitrogen fixation reduces N₂ to

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Correct Answer
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Correct Answer
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The nonessential amino acids have carbon...
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Correct Answer
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Correct Answer
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Covalent modification of glutamine synth...
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Correct Answer
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