Question 1

Which of the following amino acids is/are ketogenic?

Accepted Answer

A)   asparagine
B)   methionine
C)   valine
D)   lysine
E)   A, B, and CF) A) and B)
G) A) and C)

Question 2

In the urea cycle, free NH4+ is coupled with carboxyphosphate to form:

Accepted Answer

A)   uretic phosphate.
B)   pyruvate.
C)   carbamic acid.
D)   All of the above.
E)   None of the aboveF) C) and D)
G) A) and E)

Question 3

Choose the correct answer from the list below. Not all of the answers will be used.
-The class of enzymes that cleaves most aromatic rings in biological systems is _____________.

Accepted Answer

A)  hyperammonemia
B)  aminotransferases
C)  methionine
D)  S-adenosylmethionine
E)  glutamate dehydrogenaseF) oxaloacetateG) biopterinH) glutamateI) hippurateJ) ureaK) dehydrataseL) dioxygenasesM) ammonia disorderN) B) and H)
O) A) and J)

Question 4

Choose the correct answer from the list below. Not all of the answers will be used.
-The molecule _______________ is formed from excess NH4+ by ureotelic organisms.

Accepted Answer

A)  hyperammonemia
B)  aminotransferases
C)  methionine
D)  S-adenosylmethionine
E)  glutamate dehydrogenaseF) oxaloacetateG) biopterinH) glutamateI) hippurateJ) ureaK) dehydrataseL) dioxygenasesM) ammonia disorderN) E) and K)
O) A) and I)

Question 5

Which of the following amino acids is/are glucogenic?

Accepted Answer

A)   asparagine
B)   methionine
C)   valine
D)   lysine
E)   A, B, and CF) A) and B)
G) None of the above

Question 6

In adults, the urea cycle produces sufficient quantities of ___________________ so that it is not considered an essential amino acid.

Accepted Answer

The answer of In adults, the urea cycle produces sufficient...

Question 7

Ammoniotelic organisms excrete excess nitrogen as:

Accepted Answer

A)   N2H8.
B)   NH4+.
C)   urea.
D)   All of the above.
E)   None of the above.F) A) and E)
G) C) and D)

Question 8

Choose the correct answer from the list below. Not all of the answers will be used.
-_______________ is caused by defects in the urea cycle, which lead to an elevated level of ammonia in blood.

Accepted Answer

A)  hyperammonemia
B)  aminotransferases
C)  methionine
D)  S-adenosylmethionine
E)  glutamate dehydrogenaseF) oxaloacetateG) biopterinH) glutamateI) hippurateJ) ureaK) dehydrataseL) dioxygenasesM) ammonia disorderN) A) and H)
O) A) and G)

Question 9

Ketogenic amino acids are degraded to which of the following metabolites?

Accepted Answer

A)   pyruvate
B)   acetyl CoA
C)   acetoacetate
D)   All of the above.
E)   B and CF) A) and B)
G) C) and E)

Question 10

Choose the correct answer from the list below. Not all of the answers will be used.
-The cofactor required by phenylalanine hydroxylase is _______________.

Accepted Answer

A)  hyperammonemia
B)  aminotransferases
C)  methionine
D)  S-adenosylmethionine
E)  glutamate dehydrogenaseF) oxaloacetateG) biopterinH) glutamateI) hippurateJ) ureaK) dehydrataseL) dioxygenasesM) ammonia disorderN) C) and J)
O) F) and J)

Question 11

Serine dehydratase catalyzes the conversion of serine into NH4+ and ___________________.

Accepted Answer

The answer of Serine dehydratase catalyzes the conversion of serine...

Question 12

The urea cycle is linked to gluconeogenesis via formation of ___________________, a precursor of glucose synthesis.

Accepted Answer

The answer of The urea cycle is linked to gluconeogenesis...

Question 13

Oxidative deamination of glutamate results in free ammonium ions and ___________________.

Accepted Answer

The answer of Oxidative deamination of glutamate results in free...

Question 14

Describe the glucose-alanine cycle and its significance in amino acid metabolism.

Accepted Answer

During prolonged exercise and fasting, m...

Question 15

___________________ is the prosthetic group used in deaminations by dehydratases.

Accepted Answer

pyridoxal ...

Question 16

In the urea cycle, the carbon skeleton of aspartate is preserved as:

Accepted Answer

A)   succinate.
B)   fumarate.
C)   urea.
D)   All of the above.
E)   None of the above.F) D) and E)
G) B) and E)

Question 17

The urea cycle is:

Accepted Answer

A)   a system for protein degradation and turnover.
B)   responsible for nitrogen fixing.
C)   responsible for the filtering of nitrogen by the kidney.
D)   a system involved in transporting nitrogen from muscle to the liver.
E)   None of the above.F) A) and B)
G) B) and C)

Question 18

Why are more uricotelic organisms found in the desert than in the tropics?

Accepted Answer

Uricotelic organisms remove to...

Question 19

What general feature is involved in the degration of aromatic amino acids?

Accepted Answer

The cleavage of arom...

Question 20

Choose the correct answer from the list below. Not all of the answers will be used.
-The molecule _______________ is oxidatively deaminated to an ammonium ion.

Accepted Answer

A)  hyperammonemia
B)  aminotransferases
C)  methionine
D)  S-adenosylmethionine
E)  glutamate dehydrogenaseF) oxaloacetateG) biopterinH) glutamateI) hippurateJ) ureaK) dehydrataseL) dioxygenasesM) ammonia disorderN) A) and E)
O) C) and E)

Exam 30: Amino Acid Degradation and the Urea Cycle

In adults, the urea cycle produces sufficient quantities of ___________________ so that it is not considered an essential amino acid.

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Ammoniotelic organisms excrete excess nitrogen as:

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Ketogenic amino acids are degraded to which of the following metabolites?

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Oxidative deamination of glutamate results in free ammonium ions and ___________________.

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The urea cycle is linked to gluconeogenesis via formation of ___________________, a precursor of glucose synthesis.

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Serine dehydratase catalyzes the conversion of serine into NH4+ and ___________________.

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___________________ is the prosthetic group used in deaminations by dehydratases.

Correct Answerverifiedpyridoxal ...View AnswerShow Answer

Which of the following amino acids is/are glucogenic?

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Choose the correct answer from the list below. Not all of the answers will be used. -The molecule _______________ is oxidatively deaminated to an ammonium ion.

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Why are more uricotelic organisms found in the desert than in the tropics?

Correct AnswerverifiedUricotelic organisms remove to...View AnswerShow Answer

Describe the glucose-alanine cycle and its significance in amino acid metabolism.

Correct AnswerverifiedDuring prolonged exercise and fasting, m...View AnswerShow Answer

The urea cycle is:

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Choose the correct answer from the list below. Not all of the answers will be used. -_______________ is caused by defects in the urea cycle, which lead to an elevated level of ammonia in blood.

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Choose the correct answer from the list below. Not all of the answers will be used. -The molecule _______________ is formed from excess NH4+ by ureotelic organisms.

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In the urea cycle, free NH4+ is coupled with carboxyphosphate to form:

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Choose the correct answer from the list below. Not all of the answers will be used. -The cofactor required by phenylalanine hydroxylase is _______________.

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Choose the correct answer from the list below. Not all of the answers will be used. -The class of enzymes that cleaves most aromatic rings in biological systems is _____________.

Correct AnswerverifiedShow Answer

What general feature is involved in the degration of aromatic amino acids?

Correct AnswerverifiedThe cleavage of arom...View AnswerShow Answer

Which of the following amino acids is/are ketogenic?

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In the urea cycle, the carbon skeleton of aspartate is preserved as:

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pyridoxal ...
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Uricotelic organisms remove to...
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During prolonged exercise and fasting, m...
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In the urea cycle, free NH₄⁺ is coupled with carboxyphosphate to form:

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The cleavage of arom...
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