Question 1

Which intermediates of the Krebs bicycle would be found in the cytosol?

Accepted Answer

A)  fumerate and argininosuccinate 
B)  citrulline and malate 
C)  arginine and oxaloacetate 
D)  urea and ammonia 
A)  fumerate and argininosuccinate 
B)  citrulline and malate 
C)  arginine and oxaloacetate 
D)  urea and ammonia

Question 2

The urea cycle's function is to __________ the body of an organism.

Accepted Answer

A)  remove excess sugar from 
B)  remove excess water-soluble vitamins from 
C)  remove excess nitrogen from 
D)  add additional nitrogen to 
A)  remove excess sugar from 
B)  remove excess water-soluble vitamins from 
C)  remove excess nitrogen from 
D)  add additional nitrogen to

Question 3

In the production of urea,the carbon atom comes from

Accepted Answer

A)  water. 
B)  carbamoyl phosphate. 
C)  aspartate. 
D)  the citrate cycle. 
A)  water. 
B)  carbamoyl phosphate. 
C)  aspartate. 
D)  the citrate cycle.

Question 4

Aminotransferase reactions operate at   G      
0)What occurs when there is high substrate availability?

Accepted Answer

A) Mostly reactants are made. 
B) Mostly products are made. 
C) Equal amount of products and reactants are made. 
D) This reaction is thermodynamically unfavorable. 
A) Mostly reactants are made. 
B) Mostly products are made. 
C) Equal amount of products and reactants are made. 
D) This reaction is thermodynamically unfavorable.

Question 5

If plants and bacteria were unable to produce glutamate from ammonia,a possible outcome would be that plants would

Accepted Answer

A)  be able to produce more nucleotides. 
B)  no longer be able to produce other amino acids. 
C)  not be able to complete glycolysis. 
D)  be able to produce more ATP. 
A)  be able to produce more nucleotides. 
B)  no longer be able to produce other amino acids. 
C)  not be able to complete glycolysis. 
D)  be able to produce more ATP.

Question 6

Given that glutamate dehydrogenase has a Km of 1 mM and   G of +30 kJ/mol,glutamate dehydrogenase only operates best when

Accepted Answer

A)  there is a high concentration of nitrogen available. 
B)  there is a low concentration of nitrogen available. 
C)  operates regardless of nitrogen concentration. 
D)  Not enough information is given. 
A)  there is a high concentration of nitrogen available. 
B)  there is a low concentration of nitrogen available. 
C)  operates regardless of nitrogen concentration. 
D)  Not enough information is given.

Question 7

What are the key enzymes,intermediates,and products of heme catalysis?

Accepted Answer

As shown in Figure 17.54 in the text, @#IMG-DLM&_T

Question 8

What nitrogen source is used to produce carbamoyl phosphate?

Accepted Answer

A)  alanine 
B)  urea 
C)  ammonia 
D)  glutamine 
A)  alanine 
B)  urea 
C)  ammonia 
D)  glutamine

Question 9

Which of the following is the correct net reaction of nitrogen fixation in bacteria?

Accepted Answer

A)  N2 + 8H+ + 8e    + 16 ATP + 16 H2O  2NH3 + H2 + 16 ADP + 16 Pi 
B)  N2 + 8H+ + 8e    + 16 ADP + 16 H2O  2NH3 + H2 + 16 ATP + 16 Pi 
C)  2N2 + 8H+ + 8e    + 16 ATP + 16 H2O  NH3 + 4H2 + 16 ADP + 16 Pi 
D)  2NH3 + H2 + 16 ADP + 16 Pi  N2 + 8H+ + 8e    + 16 ATP + 16 H2O 
A)  N2 + 8H+ + 8e    + 16 ATP + 16 H2O  2NH3 + H2 + 16 ADP + 16 Pi 
B)  N2 + 8H+ + 8e    + 16 ADP + 16 H2O  2NH3 + H2 + 16 ATP + 16 Pi 
C)  2N2 + 8H+ + 8e    + 16 ATP + 16 H2O  NH3 + 4H2 + 16 ADP + 16 Pi 
D)  2NH3 + H2 + 16 ADP + 16 Pi  N2 + 8H+ + 8e    + 16 ATP + 16 H2O

Question 10

Summarize the role of the glycine in the biosynthesis of heme,tyrosine for epinephrine and pheomelanins,and arginine for nitric oxide.

Accepted Answer

Glycine is required for heme biosynthesi

Question 11

How can individuals with urea cycle deficiencies be treated with sodium phenylbutyrate?

Accepted Answer

One way to remove excess nitrogen in ind

Question 12

Arginine,leucine,and lysine are all essential amino acids.This means that they are

Accepted Answer

A)  only available from a person's diet. 
B)  produced from other intermediates. 
C)  not needed for a body to function. 
D)  the main intermediates to the urea cycle. 
A)  only available from a person's diet. 
B)  produced from other intermediates. 
C)  not needed for a body to function. 
D)  the main intermediates to the urea cycle.

Question 13

What amino acid serves as the precursor to heme?

Accepted Answer

A)  histidine 
B)  asparagine 
C)  glycine 
D)  glutamine 
A)  histidine 
B)  asparagine 
C)  glycine 
D)  glutamine

Question 14

How does Viagra interact with the mechanism of endothelial nitric oxide synthase?

Accepted Answer

As illustrated in Figure 17.64 in the te

Question 15

The recycling of fumerate helps offset the energy cost of the urea cycle because fumerate helps generate

Accepted Answer

A)  arginine to produce 2 ATP. 
B)  citrulline to produce NADPH, which can generate 3 ATP. 
C)  oxaloacetate to produce NADH, which can generate 2.5 ATP. 
D)  urea, which will make more ATP. 
A)  arginine to produce 2 ATP. 
B)  citrulline to produce NADPH, which can generate 3 ATP. 
C)  oxaloacetate to produce NADH, which can generate 2.5 ATP. 
D)  urea, which will make more ATP.

Question 16

Which of the following is the correct net reaction for the combined reaction of glutamine synthetase and glutamate synthase?

Accepted Answer

A)    -ketoglutarate + NH4+ + ATP + NADH + H+  NAD+ + ADP + Pi + glutamate 
B)  NAD+ + ADP + Pi + glutamate    -ketoglutarate + NH4+ + ATP + NADH + H+ 
C)    -ketoglutarate + NH4+ + ATP + NADH + H+  NAD+ + ADP + Pi + glutamine 
D)  glutamate + NH4+ + ATP + NADH + H+  NAD+ + ADP + Pi +  -ketoglutarate 
A)    -ketoglutarate + NH4+ + ATP + NADH + H+  NAD+ + ADP + Pi + glutamate 
B)  NAD+ + ADP + Pi + glutamate    -ketoglutarate + NH4+ + ATP + NADH + H+ 
C)    -ketoglutarate + NH4+ + ATP + NADH + H+  NAD+ + ADP + Pi + glutamine 
D)  glutamate + NH4+ + ATP + NADH + H+  NAD+ + ADP + Pi +  -ketoglutarate

Question 17

After food enters the stomach,gastrin triggers the release of __________ and secretion of __________.

Accepted Answer

A)  gastric juices; pepsinogen 
B)  gastric juices; chyme 
C)  chime; enteropeptidase 
D)  secreton; enteropeptidase 
A)  gastric juices; pepsinogen 
B)  gastric juices; chyme 
C)  chime; enteropeptidase 
D)  secreton; enteropeptidase

Question 18

A possible outcome if E.coli was depleted in NADPH would be

Accepted Answer

A)  buildup of lysine. 
B)  depletion of asparagine. 
C)  buildup of aspartate. 
D)  depletion of methionine. 
A)  buildup of lysine. 
B)  depletion of asparagine. 
C)  buildup of aspartate. 
D)  depletion of methionine.

Question 19

What is the net reaction of nitrogen assimilation in plants?

Accepted Answer

A)  Glutamate + ADP + Pi + NADP+      -Ketoglutarate + NH4+ + ATP + NADPH + H+ 
B)    -Ketoglutarate + NH4+ + ATP + NADPH + H+  Glutamate + ADP + Pi + NADP+ 
C)    -Ketoglutarate + NH4+ + ADP + NADPH + H+  Glutamate + ATP + Pi + NADP+ 
D)    -Ketoglutarate + NH4+ + ATP + NADP+ + H+  Glutamate + ADP + Pi + NADPH 
A)  Glutamate + ADP + Pi + NADP+      -Ketoglutarate + NH4+ + ATP + NADPH + H+ 
B)    -Ketoglutarate + NH4+ + ATP + NADPH + H+  Glutamate + ADP + Pi + NADP+ 
C)    -Ketoglutarate + NH4+ + ADP + NADPH + H+  Glutamate + ATP + Pi + NADP+ 
D)    -Ketoglutarate + NH4+ + ATP + NADP+ + H+  Glutamate + ADP + Pi + NADPH

Question 20

The nitrogen balance in the biosphere incorporates which of the following processes?

Accepted Answer

A)  nitrogen fixation, nitrogen assimilation, and nitrate reduction 
B)  nitrogen oxidation and nitrogen reduction 
C)  nitrogen fixation, nitrification, and nitrate reduction 
D)  nitrogen oxidation and nitrate assimilation 
A)  nitrogen fixation, nitrogen assimilation, and nitrate reduction 
B)  nitrogen oxidation and nitrogen reduction 
C)  nitrogen fixation, nitrification, and nitrate reduction 
D)  nitrogen oxidation and nitrate assimilation

Exam 17: Amino Acid Metabolism

Which intermediates of the Krebs bicycle would be found in the cytosol?

The urea cycle's function is to __________ the body of an organism.

In the production of urea,the carbon atom comes from

Aminotransferase reactions operate at G 0)What occurs when there is high substrate availability?

If plants and bacteria were unable to produce glutamate from ammonia,a possible outcome would be that plants would

Given that glutamate dehydrogenase has a Km of 1 mM and G of +30 kJ/mol,glutamate dehydrogenase only operates best when

What are the key enzymes,intermediates,and products of heme catalysis?

What nitrogen source is used to produce carbamoyl phosphate?

Which of the following is the correct net reaction of nitrogen fixation in bacteria?

Summarize the role of the glycine in the biosynthesis of heme,tyrosine for epinephrine and pheomelanins,and arginine for nitric oxide.

How can individuals with urea cycle deficiencies be treated with sodium phenylbutyrate?

Arginine,leucine,and lysine are all essential amino acids.This means that they are

What amino acid serves as the precursor to heme?

How does Viagra interact with the mechanism of endothelial nitric oxide synthase?

The recycling of fumerate helps offset the energy cost of the urea cycle because fumerate helps generate

Which of the following is the correct net reaction for the combined reaction of glutamine synthetase and glutamate synthase?

After food enters the stomach,gastrin triggers the release of __________ and secretion of __________.

A possible outcome if E.coli was depleted in NADPH would be

What is the net reaction of nitrogen assimilation in plants?

The nitrogen balance in the biosphere incorporates which of the following processes?

Principles of Biochemistry

Physical Biochemistry: Energy Conversion,water,and Membranes

Nucleic Acid Structure and Function

Protein Structure

Methods in Protein Biochemistry

Protein Function

Enzyme Mechanisms

Cell Signaling Systems

Glycolysis: a Paradigm of Metabolic Regulation

The Citrate Cycle

Oxidative Phosphorylation

Photosynthesis

Carbohydrate Structure and Function

Carbohydrate Metabolism

Lipid Structure and Function

Lipid Metabolism

Nucleotide Metabolism

Metabolic Integration

Dna Replication, repair, and Recombination

Rna Synthesis, processing, and Gene Silencing

Protein Synthesis, posttranslational Modification, and Transport

Gene Regulation

Filters

Given that glutamate dehydrogenase has a K_m of 1 mM and G of +30 kJ/mol,glutamate dehydrogenase only operates best when

After food enters the stomach,gastrin triggers the release of and secretion of .