Question 1

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

Accepted Answer

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

Question 2

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 3

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

Question 4

Ammoniotelic organisms excrete excess nitrogen as:

Accepted Answer

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

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

Question 6

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 7

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 dehydrogenase
F)oxaloacetate
G)biopterin
H)glutamate
I)hippurate
J)urea
K)dehydratase
L)dioxygenases
M)ammonia disorder 
A) hyperammonemia 
B) aminotransferases 
C) methionine 
D) S-adenosylmethionine 
E) glutamate dehydrogenase
F)oxaloacetate
G)biopterin
H)glutamate
I)hippurate
J)urea
K)dehydratase
L)dioxygenases
M)ammonia disorder

Question 8

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. 
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.

Question 9

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

Accepted Answer

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

Question 10

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 dehydrogenase
F)oxaloacetate
G)biopterin
H)glutamate
I)hippurate
J)urea
K)dehydratase
L)dioxygenases
M)ammonia disorder 
A) hyperammonemia 
B) aminotransferases 
C) methionine 
D) S-adenosylmethionine 
E) glutamate dehydrogenase
F)oxaloacetate
G)biopterin
H)glutamate
I)hippurate
J)urea
K)dehydratase
L)dioxygenases
M)ammonia disorder

Question 11

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

Question 12

Which of the following amino acids is/are ketogenic?

Accepted Answer

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

Question 13

___________________ is the prosthetic group used in deaminations by dehydratases.

Accepted Answer

pyridoxal

Question 14

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 dehydrogenase
F)oxaloacetate
G)biopterin
H)glutamate
I)hippurate
J)urea
K)dehydratase
L)dioxygenases
M)ammonia disorder 
A) hyperammonemia 
B) aminotransferases 
C) methionine 
D) S-adenosylmethionine 
E) glutamate dehydrogenase
F)oxaloacetate
G)biopterin
H)glutamate
I)hippurate
J)urea
K)dehydratase
L)dioxygenases
M)ammonia disorder

Question 15

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

Accepted Answer

The cleavage of arom

Question 16

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 dehydrogenase
F)oxaloacetate
G)biopterin
H)glutamate
I)hippurate
J)urea
K)dehydratase
L)dioxygenases
M)ammonia disorder 
A) hyperammonemia 
B) aminotransferases 
C) methionine 
D) S-adenosylmethionine 
E) glutamate dehydrogenase
F)oxaloacetate
G)biopterin
H)glutamate
I)hippurate
J)urea
K)dehydratase
L)dioxygenases
M)ammonia disorder

Question 17

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 dehydrogenase
F)oxaloacetate
G)biopterin
H)glutamate
I)hippurate
J)urea
K)dehydratase
L)dioxygenases
M)ammonia disorder 
A) hyperammonemia 
B) aminotransferases 
C) methionine 
D) S-adenosylmethionine 
E) glutamate dehydrogenase
F)oxaloacetate
G)biopterin
H)glutamate
I)hippurate
J)urea
K)dehydratase
L)dioxygenases
M)ammonia disorder

Question 18

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

Accepted Answer

During prolonged exercise and fasting, m

Question 19

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

Question 20

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

Accepted Answer

Uricotelic organisms remove to

Exam 30: Amino Acid Degradation and the Urea Cycle

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

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

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

Ammoniotelic organisms excrete excess nitrogen as:

Which of the following amino acids is/are glucogenic?

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

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

The urea cycle is:

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

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 _____________.

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

Which of the following amino acids is/are ketogenic?

___________________ is the prosthetic group used in deaminations by dehydratases.

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.

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

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.

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.

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

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

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

Biochemistry and the Unity of Life

Water, Weak Bonds, and the Generation of Order Out of Chaos

Amino Acids

Protein Three-Dimensional Structure

Techniques in Protein Biochemistry

Basic Concepts of Enzyme Action

Kinetics and Regulation

Mechanisms and Inhibitors

Hemoglobin: an Allosteric Protein

Carbohydrates

Lipids

Membrane Structure and Function

Signal Transduction Pathways

Digestion: Turning a Meal Into Cellular Biochemicals

Metabolism: Basic Concepts and Design

Glycolysis

Gluconeogenesis

Preparation for the Cycle

Harvesting Electrons From the Cycle

The Electron Transport Chain

The Proton-Motive Force

The Light Reactions

The Calvin Cycle

Glycogen Degradation

Glycogen Synthesis

The Pentose Phosphate Pathway

Fatty Acid Degredation

Fatty Acid Synthesis

Lipid Synthesis

Amino Acids Synthesis

Nucleotide Metabolism

The Structure of Informational Macromolecules: Dna and Rna

DNA Replication

DNA Repair and Recombination

RNA Synthesis and Regulation in Prokaryotes

Gene Expression in Eukaryotes

RNA Processing in Eukaryotes

The Genetic Code

The Mechanism of Protein Synthesis

Recombinant DNA Techniques

Filters

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