Question 1

Glutamate is the precursor for the amino acids glutamine, proline, and __________________.

Accepted Answer

arginine

Question 2

Which amino acid is added to indole to form tryptophan?

Accepted Answer

A)  glutamine 
B)  serine 
C)  tyrosine 
D)  All of the above. 
E)  None of the above. 
A)  glutamine 
B)  serine 
C)  tyrosine 
D)  All of the above. 
E)  None of the above. B

Question 3

Erythrose 4-phosphate is a precursor to the amino acids:

Accepted Answer

A)  tryptophan, tyrosine, and phenylalanine. 
B)  tryptophan and phenylalanine. 
C)  tyrosine and phenylalanine. 
D)  tryptophan, tyrosine, phenylalanine, and serine. 
E)  None of the above. 
A)  tryptophan, tyrosine, and phenylalanine. 
B)  tryptophan and phenylalanine. 
C)  tyrosine and phenylalanine. 
D)  tryptophan, tyrosine, phenylalanine, and serine. 
E)  None of the above. A

Question 4

What determines the range of one-carbon units carried by tetrahydrofolate?

Accepted Answer

One-carbon units bind to the pteridine r

Question 5

An example of a reaction controlled by enzyme multiplicity is:

Accepted Answer

A)  phosphorylation of asparagine by aspartokinases. 
B)  phosphorylation of aspartate by aspartokinases. 
C)  phosphorylation of glutamine by glutamine synthetase. 
D)  All of the above. 
E)  None of the above. 
A)  phosphorylation of asparagine by aspartokinases. 
B)  phosphorylation of aspartate by aspartokinases. 
C)  phosphorylation of glutamine by glutamine synthetase. 
D)  All of the above. 
E)  None of the above.

Question 6

What is a major difference between the amino acid biosynthetic capacity of prokaryotic organisms and humans?

Accepted Answer

Whereas microorganisms can make most of

Question 7

Homocysteine is an intermediate in the synthesis of cysteine and __________________.

Accepted Answer

The answer of Homocysteine is an intermediate in the synthesis...

Question 8

Which gaseous plant hormone is involved in triggering ripening?

Accepted Answer

A)  melanin 
B)  epinephrine 
C)  ethylene 
D)  A and B 
E)  A and C 
A)  melanin 
B)  epinephrine 
C)  ethylene 
D)  A and B 
E)  A and C

Question 9

Choose the correct answer from the list below. Not all of the answers will be used.
-_______________ is a cofactor for transamination reactions.

Accepted Answer

A) atmospheric nitrogen (N2) 
B) 3-phosphoglycerate 
C) cumulative 
D) nitrogen fixation 
E) B12
F)histidine
G)tetrahydrofolate
H)committed
I)pyridoxal phosphate
J)enzyme multiplicity
K)MoFe cofactor
L)ammonia (NH3) 
A) atmospheric nitrogen (N2) 
B) 3-phosphoglycerate 
C) cumulative 
D) nitrogen fixation 
E) B12
F)histidine
G)tetrahydrofolate
H)committed
I)pyridoxal phosphate
J)enzyme multiplicity
K)MoFe cofactor
L)ammonia (NH3)

Question 10

Only a few prokaryotes, such as __________________, are able convert N2 to ammonia.

Accepted Answer

nitrogen-f

Question 11

What is enzyme multiplicity?

Accepted Answer

This is a strategy for regulation in whi

Question 12

Metabolic pathways that have alternate products are often regulated by __________________and ____________.

Accepted Answer

feedback i

Question 13

Essential amino acids differ from nonessential amino acids in that:

Accepted Answer

A)  nonessential amino acids are synthesized in simple reactions compared to many for most essential amino acids. 
B)  essential amino acids are generally synthesized directly from citric acid cycle intermediates, but nonessential amino acids are not. 
C)  microorganisms and animals cannot synthesize essential amino acids but plants can. 
D)  animals cannot synthesize essential amino acids because they have lost the ability to carry out transamination reactions. 
E)  None of the above. 
A)  nonessential amino acids are synthesized in simple reactions compared to many for most essential amino acids. 
B)  essential amino acids are generally synthesized directly from citric acid cycle intermediates, but nonessential amino acids are not. 
C)  microorganisms and animals cannot synthesize essential amino acids but plants can. 
D)  animals cannot synthesize essential amino acids because they have lost the ability to carry out transamination reactions. 
E)  None of the above.

Question 14

The rates of synthesis of amino acid metabolic pathways often depends on the:

Accepted Answer

A)  committed step. 
B)  allosteric regulation. 
C)  feedback inhibition. 
D)  All of the above. 
E)  None of the above. 
A)  committed step. 
B)  allosteric regulation. 
C)  feedback inhibition. 
D)  All of the above. 
E)  None of the above.

Question 15

Describe the effect of cumulative inhibition.

Accepted Answer

This describes a situation in which seve

Question 16

Choose the correct answer from the list below. Not all of the answers will be used.
-_______________ is the site of nitrogen fixation by nitrogenase enzymes.

Accepted Answer

A) atmospheric nitrogen (N2) 
B) 3-phosphoglycerate 
C) cumulative 
D) nitrogen fixation 
E) B12
F)histidine
G)tetrahydrofolate
H)committed
I)pyridoxal phosphate
J)enzyme multiplicity
K)MoFe cofactor
L)ammonia (NH3) 
A) atmospheric nitrogen (N2) 
B) 3-phosphoglycerate 
C) cumulative 
D) nitrogen fixation 
E) B12
F)histidine
G)tetrahydrofolate
H)committed
I)pyridoxal phosphate
J)enzyme multiplicity
K)MoFe cofactor
L)ammonia (NH3)

Question 17

Methyl, methylene, and __________________ units can be carried by tetrahydrofolate.

Accepted Answer

The answer of Methyl, methylene, and __________________ units can be...

Question 18

What is significant about many of the intermediates in amino acid biosynthesis?

Accepted Answer

Many of the biosynthetic intermediates c

Question 19

Choose the correct answer from the list below. Not all of the answers will be used.
-Methylcobalamine is derived from vitamin _______________.

Accepted Answer

A) atmospheric nitrogen (N2) 
B) 3-phosphoglycerate 
C) cumulative 
D) nitrogen fixation 
E) B12
F)histidine
G)tetrahydrofolate
H)committed
I)pyridoxal phosphate
J)enzyme multiplicity
K)MoFe cofactor
L)ammonia (NH3) 
A) atmospheric nitrogen (N2) 
B) 3-phosphoglycerate 
C) cumulative 
D) nitrogen fixation 
E) B12
F)histidine
G)tetrahydrofolate
H)committed
I)pyridoxal phosphate
J)enzyme multiplicity
K)MoFe cofactor
L)ammonia (NH3)

Question 20

Glutamine synthetase adds NH3 to __________________ to make glutamine.

Accepted Answer

Exam 31: Amino Acids Synthesis

Glutamate is the precursor for the amino acids glutamine, proline, and __________________.

Which amino acid is added to indole to form tryptophan?

Erythrose 4-phosphate is a precursor to the amino acids:

What determines the range of one-carbon units carried by tetrahydrofolate?

An example of a reaction controlled by enzyme multiplicity is:

What is a major difference between the amino acid biosynthetic capacity of prokaryotic organisms and humans?

Homocysteine is an intermediate in the synthesis of cysteine and __________________.

Which gaseous plant hormone is involved in triggering ripening?

Choose the correct answer from the list below. Not all of the answers will be used. -_______________ is a cofactor for transamination reactions.

Only a few prokaryotes, such as __________________, are able convert N2 to ammonia.

What is enzyme multiplicity?

Metabolic pathways that have alternate products are often regulated by __________________and ____________.

Essential amino acids differ from nonessential amino acids in that:

The rates of synthesis of amino acid metabolic pathways often depends on the:

Describe the effect of cumulative inhibition.

Choose the correct answer from the list below. Not all of the answers will be used. -_______________ is the site of nitrogen fixation by nitrogenase enzymes.

Methyl, methylene, and __________________ units can be carried by tetrahydrofolate.

What is significant about many of the intermediates in amino acid biosynthesis?

Choose the correct answer from the list below. Not all of the answers will be used. -Methylcobalamine is derived from vitamin _______________.

Glutamine synthetase adds NH3 to __________________ to make glutamine.

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 Acid Degradation and the Urea Cycle

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

Metabolic pathways that have alternate products are often regulated by ______and .

Glutamine synthetase adds NH₃ to __________________ to make glutamine.