Question 1

Which of the following amino acids is both glucogenic and ketogenic?

Accepted Answer

A)  Lysine 
B)  Leucine 
C)  Tryptophan 
D)  Cysteine 
E)  Arginine 
A)  Lysine 
B)  Leucine 
C)  Tryptophan 
D)  Cysteine 
E)  Arginine C

Question 2

All amino acids can be synthesized from intermediates of the:

Accepted Answer

A)  glycolytic pathway alone. 
B)  glycolytic pathway and the pentose phosphate pathway. 
C)  citric acid cycle alone. 
D)  the glycolytic pathway and citric acid cycle. 
E)  the glycolytic pathway, the pentose phosphate pathway and citric acid cycle. 
A)  glycolytic pathway alone. 
B)  glycolytic pathway and the pentose phosphate pathway. 
C)  citric acid cycle alone. 
D)  the glycolytic pathway and citric acid cycle. 
E)  the glycolytic pathway, the pentose phosphate pathway and citric acid cycle. E

Question 3

Transamination reactions can be used to degrade or synthesize amino acids because they have an ________ that has a value close to one.

Accepted Answer

equilibrium constant

Question 4

________ high energy phosphates from ATP are consumed in each turn of the urea cycle.

Accepted Answer

The answer of ________ high energy phosphates from ATP are...

Question 5

The common degradation product of lysine, tryptophan, phenylalanine and tyrosine is ________.

Accepted Answer

The answer of The common degradation product of lysine, tryptophan,...

Question 6

Nitrogen fixation requires the hydrolysis of 8 ATPs to produce 2 NH3 molecules from 1 N2.

Accepted Answer

A) True 
 B)False

Question 7

The oxidation of branched chain amino acids shares a similar chemical strategy with β-oxidation of fatty acids.

Accepted Answer

A) True 
 B)False

Question 8

The H2S produced by metabolism of cysteine is a waste product with no physiological or biochemical function.

Accepted Answer

A) True 
 B)False

Question 9

N2 gas can be converted to NH3 by:

Accepted Answer

A)  most organisms. 
B)  mammals. 
C)  all plants. 
D)  all bacteria. 
E)  legumes. 
A)  most organisms. 
B)  mammals. 
C)  all plants. 
D)  all bacteria. 
E)  legumes.

Question 10

In the degradation of amino acids in muscle NH4+ is carried to the liver for conversion into urea by:

Accepted Answer

A)  glutamine. 
B)  asparagine. 
C)  alanine. 
D)  either alanine or glutamine. 
E)  any amino acid. 
A)  glutamine. 
B)  asparagine. 
C)  alanine. 
D)  either alanine or glutamine. 
E)  any amino acid.

Question 11

Which of the following enzymes is NOT involved in the conversion of NH3 to an organic nitrogen-containing compound?

Accepted Answer

A)  Glutamate dehydrogenase 
B)  Carbamoyl phosphate dehydrogenase 
C)  Glutamate-oxaloacetate transaminase 
D)  Glutamine synthetase 
E)  Asparagine synthetase 
A)  Glutamate dehydrogenase 
B)  Carbamoyl phosphate dehydrogenase 
C)  Glutamate-oxaloacetate transaminase 
D)  Glutamine synthetase 
E)  Asparagine synthetase

Question 12

Which of the following amino acids cannot be used to provide an intermediate of the citric acid cycle?

Accepted Answer

A)  Histidine 
B)  Proline 
C)  Phenylalanine 
D)  Lysine 
E)  Tyrosine 
A)  Histidine 
B)  Proline 
C)  Phenylalanine 
D)  Lysine 
E)  Tyrosine

Question 13

The Krebs-Henseleit urea cycle takes place in liver cells entirely within the mitochondrion.

Accepted Answer

A) True 
 B)False

Question 14

Tetrahydrofolate is a coenzyme involved in the mobilization and utilization of single carbon functional units in the:

Accepted Answer

A)  metabolism of serine, glycine, methionine, and histidine. 
B)  biosynthesis of purine nucleotides. 
C)  biosynthesis of thymine. 
D)  biosynthesis of formylmethionyl-tRNA. 
E)  all of the above. 
A)  metabolism of serine, glycine, methionine, and histidine. 
B)  biosynthesis of purine nucleotides. 
C)  biosynthesis of thymine. 
D)  biosynthesis of formylmethionyl-tRNA. 
E)  all of the above.

Question 15

Tyrosine is the precursor of serotonin which has a number of roles in the nervous system.

Accepted Answer

A) True 
 B)False

Question 16

Folate deficiency results in increased risk of cardiovascular disease associated with abnormally high levels of serum ________ due to decreased levels of tetrahydrofolate cofactors required for the methionine synthase reaction.

Accepted Answer

The answer of Folate deficiency results in increased risk of...

Question 17

Nitrate can be reduced to ammonia by virtually all organisms.

Accepted Answer

A) True 
 B)False

Question 18

Pyridoxal phosphate is a versatile coenzyme as it is capable of forming a stable ________ base between an amino acid substrate and the coenzyme.

Accepted Answer

The answer of Pyridoxal phosphate is a versatile coenzyme as...

Question 19

Apart from in the synthesis of methionine, S-adenosylmethionine is the only biological ________ group donor.

Accepted Answer

The answer of Apart from in the synthesis of methionine,...

Question 20

The catecholamine neurotransmitters are derived from ________.

Accepted Answer

The answer of The catecholamine neurotransmitters are derived from ________....

Exam 18: Amino Acid and Nitrogen Metabolism

Which of the following amino acids is both glucogenic and ketogenic?

All amino acids can be synthesized from intermediates of the:

Transamination reactions can be used to degrade or synthesize amino acids because they have an ________ that has a value close to one.

________ high energy phosphates from ATP are consumed in each turn of the urea cycle.

The common degradation product of lysine, tryptophan, phenylalanine and tyrosine is ________.

Nitrogen fixation requires the hydrolysis of 8 ATPs to produce 2 NH3 molecules from 1 N2.

The oxidation of branched chain amino acids shares a similar chemical strategy with β-oxidation of fatty acids.

The H2S produced by metabolism of cysteine is a waste product with no physiological or biochemical function.

N2 gas can be converted to NH3 by:

In the degradation of amino acids in muscle NH4+ is carried to the liver for conversion into urea by:

Which of the following enzymes is NOT involved in the conversion of NH3 to an organic nitrogen-containing compound?

Which of the following amino acids cannot be used to provide an intermediate of the citric acid cycle?

The Krebs-Henseleit urea cycle takes place in liver cells entirely within the mitochondrion.

Tetrahydrofolate is a coenzyme involved in the mobilization and utilization of single carbon functional units in the:

Tyrosine is the precursor of serotonin which has a number of roles in the nervous system.

Folate deficiency results in increased risk of cardiovascular disease associated with abnormally high levels of serum ________ due to decreased levels of tetrahydrofolate cofactors required for the methionine synthase reaction.

Nitrate can be reduced to ammonia by virtually all organisms.

Pyridoxal phosphate is a versatile coenzyme as it is capable of forming a stable ________ base between an amino acid substrate and the coenzyme.

Apart from in the synthesis of methionine, S-adenosylmethionine is the only biological ________ group donor.

The catecholamine neurotransmitters are derived from ________.

Biochemistry and the Language of Chemistry

The Chemical Foundation of Life: Weak Interactions in an Aqueous Environment

The Energetics of Life

Nucleic Acids

Introduction to Proteins: the Primary Level of Protein Structure

The Three-Dimensional Structure of Proteins

Protein Function and Evolution

Enzymes: Biological Catalysts

Carbohydrates: Sugars, Saccharides, Glycans

Lipids, Membranes, and Cellular Transport

Chemical Logic of Metabolism

Carbohydrate Metabolism: Glycolysis, Gluconeogenesis, Glycogen Metabolism, and the Pentose Phosphate Pathway

The Citric Acid Cycle

Electron Transport, Oxidative Phosphorylation, and Oxygen Metabolism

Photosynthesis

Lipid Metabolism

Interorgan and Intracellular Coordination of Energy Metabolism in Vertebrates

Nucleotide Metabolism

Mechanisms of Signal Transduction

Genes, Genomes, and Chromosomes

DNA Replication

DNA Repair, Recombination, and Rearrangement

Transcription and Post-Transcriptional Processing

Information Decoding: Translation and Post-Translational Protein Processing

Regulation of Gene Expression

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