Question 1

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. B

Question 2

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 3

This amino acid, in high levels, is correlated with the damage of cells lining the blood vessels.

Accepted Answer

A)  serine 
B)  cysteine 
C)  S-adenosylmethionine 
D)  citrulline 
E)  homocysteine 
A)  serine 
B)  cysteine 
C)  S-adenosylmethionine 
D)  citrulline 
E)  homocysteine E

Question 4

Glutamine synthetase adds NH3 to __________________ to make glutamine.

Accepted Answer

The answer of Glutamine synthetase adds NH3 to __________________ to...

Question 5

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 6

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.

Question 7

What is the advantage of the cumulative enzymatic regulation of glutamine synthetase activity?

Accepted Answer

It allows fine-tuning and amplification

Question 8

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

Accepted Answer

Many of the biosynthetic intermediates c

Question 9

The carbon skeletons for amino acids are intermediates found in:

Accepted Answer

A)  glycolysis. 
B)  the citric acid cycle. 
C)  the pentose phosphate pathway. 
D)  All of the above. 
E)  None of the above. 
A)  glycolysis. 
B)  the citric acid cycle. 
C)  the pentose phosphate pathway. 
D)  All of the above. 
E)  None of the above.

Question 10

Describe the regulation of the enzyme threonine deaminase.

Accepted Answer

This enzyme is inhibited by isoleucine,

Question 11

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

Accepted Answer

One-carbon units bind to the pteridine r

Question 12

The electrons for the reduction of molecular nitrogen are donated by:

Accepted Answer

A)  proteins. 
B)  NADPH. 
C)  ferredoxin. 
D)  None of the above. 
E)  All of the above. 
A)  proteins. 
B)  NADPH. 
C)  ferredoxin. 
D)  None of the above. 
E)  All of the above.

Question 13

What do S-adenosylmethionine and fruit ripening have in common?

Accepted Answer

S-adenosylmethionine is a prec

Question 14

Use the following to answer questions 
Choose the correct answer from the list below. Not all of the answers will be used.
-The precursor for serine, cysteine, and glycine amino acid biosynthesis is _______________.

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 15

Through what process might feedback inhibition processes have evolved?

Accepted Answer

A)  duplication of genes encoding catalytic domains 
B)  evolution of homologous subunits in the enzyme catalyzing the committed step 
C)  linking specific regulator domains to catalytic domains 
D)  linking of multiple regulatory domains 
E)  All of the above. 
A)  duplication of genes encoding catalytic domains 
B)  evolution of homologous subunits in the enzyme catalyzing the committed step 
C)  linking specific regulator domains to catalytic domains 
D)  linking of multiple regulatory domains 
E)  All of the above.

Question 16

Use the following to answer questions 
Choose the correct answer from the list below. Not all of the answers will be used.
-Isozymes, or multiple enzymes with the same identical catalytic properties but with different regulation, are an example of _______________.

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

Use the following to answer questions 
Choose the correct answer from the list below. Not all of the answers will be used.
-The process of converting N2 to NH3 is called _______________.

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 18

The enzyme __________________ is regulated by cumulative feedback inhibition.

Accepted Answer

The answer of The enzyme __________________ is regulated by cumulative...

Question 19

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

Accepted Answer

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

Question 20

Use the following to answer questions 
Choose the correct answer from the list below. Not all of the answers will be used.
-Glutamine synthesis inhibited by _______________ feedback inhibition.

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)

Exam 31: Amino Acids Synthesis

An example of a reaction controlled by enzyme multiplicity is:

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

This amino acid, in high levels, is correlated with the damage of cells lining the blood vessels.

Glutamine synthetase adds NH3 to __________________ to make glutamine.

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

Which amino acid is added to indole to form tryptophan?

What is the advantage of the cumulative enzymatic regulation of glutamine synthetase activity?

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

The carbon skeletons for amino acids are intermediates found in:

Describe the regulation of the enzyme threonine deaminase.

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

The electrons for the reduction of molecular nitrogen are donated by:

What do S-adenosylmethionine and fruit ripening have in common?

Use the following to answer questions Choose the correct answer from the list below. Not all of the answers will be used. -The precursor for serine, cysteine, and glycine amino acid biosynthesis is _______________.

Through what process might feedback inhibition processes have evolved?

Use the following to answer questions Choose the correct answer from the list below. Not all of the answers will be used. -Isozymes, or multiple enzymes with the same identical catalytic properties but with different regulation, are an example of _______________.

Use the following to answer questions Choose the correct answer from the list below. Not all of the answers will be used. -The process of converting N2 to NH3 is called _______________.

The enzyme __________________ is regulated by cumulative feedback inhibition.

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

Use the following to answer questions Choose the correct answer from the list below. Not all of the answers will be used. -Glutamine synthesis inhibited by _______________ feedback inhibition.

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