Question 1

Which of the following conversions could occur as part of a ansamination reaction?

Accepted Answer

A)   pyruvate to alanine
B)   alanine to pyruvate
C)   oxaloacetate to glutamate
D)   more than one correct response
E)   no correct responseF) C) and D)
G) B) and E)

Question 2

Use the following to answer the questions below:
In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:
-Statements: (1)  Excess amino acids are stored in the body for later use in the form of tetra- and pentapeptides.
(2)  The ultimate product of all transamination reactions is the amino acid glutamate.
(3)  The oxygen atom in urea comes from a water molecule that participates in a hydrolysis reaction.

Accepted Answer

A)   All three statements are true.
B)   Two of the three statements are true.
C)   Only one of the statements is true.
D)   None of the statements is true.E) A) and C)
F) B) and D)

Question 3

Use the following to answer the questions below:
In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:
-Statements: (1)  Citric acid cycle intermediates are often the products from amino acid carbon skeleton degradation.
(2)  The net effect of transamination is to collect the amino groups from a variety of amino acids into the amino acids glutamate and aspartate.
(3)  All of the reactions of the urea cycle occur within mitochondria.

Accepted Answer

A)   All three statements are true.
B)   Two of the three statements are true.
C)   Only one of the statements is true.
D)   None of the statements is true.E) All of the above
F) A) and B)

Question 4

Use the following to answer the questions below:
For each of the heme degradation characterizations, select a correct degradation product from the response list. Responses may be used more than once or need not be used at all.

-CO is produced at the same time as this substance.

Accepted Answer

A)   bilirubin
B)   biliverdin
C)   stercobilin
D)   urobilinE) B) and D)
F) None of the above

Question 5

A derivative of pyridoxine (vitamin B6)  is required as a coenzyme in

Accepted Answer

A)   transamination
B)   oxidative deamination
C)   the urea cycle
D)   carbamoyl phosphate formationE) All of the above
F) A) and D)

Question 6

Use the following to answer the questions below:
For each of the urea cycle characterizations, select a correct response from the response list. Responses may be used more than once or need not be used at all.

-Reacts with carbamoyl phosphate

Accepted Answer

A)   ornithine
B)   citrulline
C)   argininosuccinate
D)   arginineE) A) and B)
F) A) and C) A

Question 7

Use the following to answer the questions below:
For each of the heme degradation characterizations, select a correct degradation product from the response list. Responses may be used more than once or need not be used at all.

-Substance that gives urine its characteristic color

Accepted Answer

A)  translation phase of protein synthesis
B)  transcription phase of protein synthesis
C)  replication of DNA
D)  post-transcription phase of protein synthesisE) A) and C)
F) B) and D)

Question 8

Use the following to answer the questions below:
Following are reactants and the type of reaction they undergo. From the response list, select the product to which each reactant is converted. Responses may be used more than once or need not be used at all.

-Transamination involving oxaloacetate

Accepted Answer

A)   alanine
B)   aspartate
C)   glutamate
D)   (-ketoglutarate) E) None of the above
F) B) and C)

Question 9

Which of the following processes supplies amino acids to the amino acid pool?

Accepted Answer

A)   protein digestion
B)   protein turnover
C)   amino acid biosynthesis
D)   more than one correct response
E)   no correct responseF) C) and D)
G) A) and B)

Question 10

Carbon-containing amino acid degradation products can be converted to

Accepted Answer

A)   glucose
B)   ketone bodies
C)   fatty acids
D)   more than one correct response
E)   no correct responseF) B) and E)
G) A) and B)

Question 11

Use the following to answer the questions below:
In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:
-Statements: (1)  A reactant and a product in the first step of the urea cycle are, respectively, ornithine and citrulline.
(2)  Degradation of heme begins with a ring-opening reaction in which carbon monoxide is produced.
(3)  With a normal diet, only about 10 percent of our total calories come from protein.

Accepted Answer

A)   All three statements are true.
B)   Two of the three statements are true.
C)   Only one of the statements is true.
D)   None of the statements is true.E) A) and B)
F) None of the above

Question 12

Use the following to answer the questions below:
In each of the following reactant-product combinations associated with the production of urea, contrast the nitrogen content of the two compounds using the response list. Responses may be used more than once or need not be used at all.

-Citrulline-argininosuccinate

Accepted Answer

A)   Nitrogen content remains the same.
B)   Nitrogen content increases by one atom.
C)   Nitrogen content increases by two atoms.
D)   Nitrogen content decreases by two atoms.E) A) and B)
F) C) and D) B

Question 13

With a normal diet, the percentage of daily calories that come from proteins is about

Accepted Answer

A)   10 percent
B)   20 percent
C)   30 percent
D)   40 percentE) None of the above
F) B) and C)

Question 14

Use the following to answer the questions below:
For each of the urea cycle characterizations, select a correct response from the response list. Responses may be used more than once or need not be used at all.

-Is one of the standard amino acids

Accepted Answer

A)   ornithine
B)   citrulline
C)   argininosuccinate
D)   arginineE) C) and D)
F) A) and B)

Question 15

Use the following to answer the questions below:
In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:
-Statements: (1)  Protein digestion begins in the stomach rather than the small intestine.
(2)  In the second step of heme degradation, biliverdin is converted to bilirubin.
(3)  In the oxidative deamination of glutamate, alpha-ketoglutarate is one of the products.

Accepted Answer

A)   All three statements are true.
B)   Two of the three statements are true.
C)   Only one of the statements is true.
D)   None of the statements is true.E) All of the above
F) A) and D)

Question 16

Use the following to answer the questions below:
In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:
-Statements: (1)  Properties of the compound urea include yellow color, strong odor, and high solubility in water.
(2)  The amino group acceptor in most transamination reactions is oxaloacetate.
(3)  Absorption of amino acids through the intestinal wall requires active transport.

Accepted Answer

A)   All three statements are true.
B)   Two of the three statements are true.
C)   Only one of the statements is true.
D)   None of the statements is true.E) All of the above
F) A) and B) C

Question 17

Use the following to answer the questions below:
For the degradation products found for a particular amino acid carbon skeleton, use the response list to characterize the amino acid in terms of ketogenicity and glucogenicity.

-Acetyl CoA only

Accepted Answer

A)   ketogenic but not glucogenic
B)   glucogenic but not ketogenic
C)   both ketogenic and glucogenic
D)   neither ketogenic nor glucogenicE) A) and B)
F) C) and D)

Question 18

Use the following to answer the questions below:
For each of the heme degradation characterizations, select a correct degradation product from the response list. Responses may be used more than once or need not be used at all.

-Molecular O2 is required as a reactant to produce this substance.

Accepted Answer

A)  translation phase of protein synthesis
B)  transcription phase of protein synthesis
C)  replication of DNA
D)  post-transcription phase of protein synthesisE) B) and C)
F) B) and D)

Question 19

The two nitrogen atoms in a urea molecule have as their biosynthetic source

Accepted Answer

A)   two ammonium ions
B)   two aspartate ions
C)   an ammonium ion and an aspartate ion
D)   two acetyl CoA moleculesE) C) and D)
F) B) and D)

Question 20

As dietary protein materials leave the stomach, they

Accepted Answer

A)   are approximately 50 percent free amino acids
B)   are approximately 90 percent free amino acids
C)   are a mixture of large polypeptides
D)   have been denatured, but no peptide bond cleavage has occurredE) A) and D)
F) A) and C)

Exam 26: Protein Metabolism

Which of the following conversions could occur as part of a ansamination reaction?

Correct Answer
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Use the following to answer the questions below: For each of the heme degradation characterizations, select a correct degradation product from the response list. Responses may be used more than once or need not be used at all. -CO is produced at the same time as this substance.

Correct Answer
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A derivative of pyridoxine (vitamin B₆) is required as a coenzyme in

Correct Answer
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Use the following to answer the questions below: For each of the urea cycle characterizations, select a correct response from the response list. Responses may be used more than once or need not be used at all. -Reacts with carbamoyl phosphate

Correct Answer
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A

Use the following to answer the questions below: For each of the heme degradation characterizations, select a correct degradation product from the response list. Responses may be used more than once or need not be used at all. -Substance that gives urine its characteristic color

Correct Answer
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Use the following to answer the questions below: Following are reactants and the type of reaction they undergo. From the response list, select the product to which each reactant is converted. Responses may be used more than once or need not be used at all. -Transamination involving oxaloacetate

Correct Answer
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Which of the following processes supplies amino acids to the amino acid pool?

Correct Answer
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Carbon-containing amino acid degradation products can be converted to

Correct Answer
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B

With a normal diet, the percentage of daily calories that come from proteins is about

Correct Answer
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Use the following to answer the questions below: For each of the urea cycle characterizations, select a correct response from the response list. Responses may be used more than once or need not be used at all. -Is one of the standard amino acids

Correct Answer
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C

Use the following to answer the questions below: For the degradation products found for a particular amino acid carbon skeleton, use the response list to characterize the amino acid in terms of ketogenicity and glucogenicity. -Acetyl CoA only

Correct Answer
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Use the following to answer the questions below: For each of the heme degradation characterizations, select a correct degradation product from the response list. Responses may be used more than once or need not be used at all. -Molecular O₂ is required as a reactant to produce this substance.

Correct Answer
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The two nitrogen atoms in a urea molecule have as their biosynthetic source

Correct Answer
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As dietary protein materials leave the stomach, they

Correct Answer
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Exam 26: Protein Metabolism

Which of the following conversions could occur as part of a ansamination reaction?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Use the following to answer the questions below: For each of the heme degradation characterizations, select a correct degradation product from the response list. Responses may be used more than once or need not be used at all. -CO is produced at the same time as this substance.

Correct AnswerverifiedShow Answer

A derivative of pyridoxine (vitamin B6) is required as a coenzyme in

Correct AnswerverifiedShow Answer

Use the following to answer the questions below: For each of the urea cycle characterizations, select a correct response from the response list. Responses may be used more than once or need not be used at all. -Reacts with carbamoyl phosphate

Correct AnswerverifiedA

Use the following to answer the questions below: For each of the heme degradation characterizations, select a correct degradation product from the response list. Responses may be used more than once or need not be used at all. -Substance that gives urine its characteristic color

Correct AnswerverifiedShow Answer

Use the following to answer the questions below: Following are reactants and the type of reaction they undergo. From the response list, select the product to which each reactant is converted. Responses may be used more than once or need not be used at all. -Transamination involving oxaloacetate

Correct AnswerverifiedShow Answer

Which of the following processes supplies amino acids to the amino acid pool?

Correct AnswerverifiedShow Answer

Carbon-containing amino acid degradation products can be converted to

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedB

With a normal diet, the percentage of daily calories that come from proteins is about

Correct AnswerverifiedShow Answer

Use the following to answer the questions below: For each of the urea cycle characterizations, select a correct response from the response list. Responses may be used more than once or need not be used at all. -Is one of the standard amino acids

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedC

Use the following to answer the questions below: For the degradation products found for a particular amino acid carbon skeleton, use the response list to characterize the amino acid in terms of ketogenicity and glucogenicity. -Acetyl CoA only

Correct AnswerverifiedShow Answer

Use the following to answer the questions below: For each of the heme degradation characterizations, select a correct degradation product from the response list. Responses may be used more than once or need not be used at all. -Molecular O2 is required as a reactant to produce this substance.

Correct AnswerverifiedShow Answer

The two nitrogen atoms in a urea molecule have as their biosynthetic source

Correct AnswerverifiedShow Answer

As dietary protein materials leave the stomach, they

Correct AnswerverifiedShow Answer

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A derivative of pyridoxine (vitamin B₆) is required as a coenzyme in

Correct Answer
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A

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B

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C

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Use the following to answer the questions below: For each of the heme degradation characterizations, select a correct degradation product from the response list. Responses may be used more than once or need not be used at all. -Molecular O₂ is required as a reactant to produce this substance.

Correct Answer
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Correct Answer
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