Question 1

Organisms capable of carrying out reduction of atmospheric nitrogen include:

Accepted Answer

A)  some bacteria and archaea. 
B)  higher eukaryotic organisms, such as mammals. 
C)  all plants. 
D)  All of the above. 
E)  None of the above. 
A)  some bacteria and archaea. 
B)  higher eukaryotic organisms, such as mammals. 
C)  all plants. 
D)  All of the above. 
E)  None of the above.

Question 2

The enzyme __________________ is regulated by cumulative feedback inhibition.

Accepted Answer

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

Question 3

S-adenosylmethionine carries which groups?

Accepted Answer

A)  methyl 
B)  CO2 
C)  ammonia 
D)  None of the above. 
E)  All of the above. 
A)  methyl 
B)  CO2 
C)  ammonia 
D)  None of the above. 
E)  All of the above.

Question 4

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)

Question 5

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 6

The α-amino group found in most amino acids comes from __________________ through a transamination reaction.

Accepted Answer

The answer of The α-amino group found in most amino...

Question 7

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 8

Draw homocysteine.

Accepted Answer

The molecu

Question 9

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 10

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

Accepted Answer

It allows fine-tuning and amplification

Question 11

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 12

The activated methyl cycle involves the production and use of:

Accepted Answer

A)  glutamine. 
B)  glycine. 
C)  heterocysteine. 
D)  homocysteine. 
E)  methanol. 
A)  glutamine. 
B)  glycine. 
C)  heterocysteine. 
D)  homocysteine. 
E)  methanol.

Question 13

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 14

What is the MoFecofactor?

Accepted Answer

This unusual redox center is the site of

Question 15

Choose the correct answer from the list below. Not all of the answers will be used.
-A versatile carrier of one-carbon units 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 16

Describe the process and proteins involved in nitrogen fixation.

Accepted Answer

Electrons are provided by ferredoxin, tr

Question 17

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 18

Choose the correct answer from the list below. Not all of the answers will be used.
-The final product pathway which inhibits an enzyme that catalyzes its production typically takes place at the _______________ step.

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 19

__________________ ATP molecules are hydrolyzed for each N2 reduced.

Accepted Answer

Question 20

The binding of serine to 3-phosphoglycerate dehydrogenase induces a __________________ in Vmax.

Accepted Answer

The answer of The binding of serine to 3-phosphoglycerate dehydrogenase...

Exam 31: Amino Acids Synthesis

Organisms capable of carrying out reduction of atmospheric nitrogen include:

The enzyme __________________ is regulated by cumulative feedback inhibition.

S-adenosylmethionine carries which groups?

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

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 _______________.

The α-amino group found in most amino acids comes from __________________ through a transamination reaction.

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 _______________.

Draw homocysteine.

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 _______________.

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

The carbon skeletons for amino acids are intermediates found in:

The activated methyl cycle involves the production and use of:

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

What is the MoFecofactor?

Choose the correct answer from the list below. Not all of the answers will be used. -A versatile carrier of one-carbon units is _______________.

Describe the process and proteins involved in nitrogen fixation.

Through what process might feedback inhibition processes have evolved?

Choose the correct answer from the list below. Not all of the answers will be used. -The final product pathway which inhibits an enzyme that catalyzes its production typically takes place at the _______________ step.

__________________ ATP molecules are hydrolyzed for each N2 reduced.

The binding of serine to 3-phosphoglycerate dehydrogenase induces a __________________ in Vmax.

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

__________________ ATP molecules are hydrolyzed for each N₂reduced.