Question 1

Glutamine synthetase adds NH3 to _______________ to make glutamine.

Accepted Answer

Question 2

What molecule is the precursor for the biosynthesis of serine,cysteine,and glycine?

Accepted Answer

A)  pyruvate 
B)  oxaloacetate 
C)  $\alpha$-ketoglutarate 
D)  glyceraldehyde-3-phosphate 
E)  3-phosphoglycerate 
A)  pyruvate 
B)  oxaloacetate 
C)  $\alpha$-ketoglutarate 
D)  glyceraldehyde-3-phosphate 
E)  3-phosphoglycerate

Question 3

Tryptophan is a precursor for the neurotransmitter(s)

Accepted Answer

A)  serotonin. 
B)  norepinephrine. 
C)  adenine. 
D)  $\gamma$-aminobutyric acid. 
E)  None of the answers is correct. 
A)  serotonin. 
B)  norepinephrine. 
C)  adenine. 
D)  $\gamma$-aminobutyric acid. 
E)  None of the answers is correct.

Question 4

Which of the following is a tripeptide that functions as an antioxidant?

Accepted Answer

A)  glutathione 
B)  aspartame 
C)  oxytocin 
D)  thyrotropin-releasing hormone 
E)  None of the answers is correct. 
A)  glutathione 
B)  aspartame 
C)  oxytocin 
D)  thyrotropin-releasing hormone 
E)  None of the answers is correct.

Question 5

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)  fungi, including yeasts and molds. 
E)  None of the answers is correct. 
A)  some bacteria and archaea. 
B)  higher eukaryotic organisms, such as mammals. 
C)  all plants. 
D)  fungi, including yeasts and molds. 
E)  None of the answers is correct.

Question 6

What is the advantage of the enzymatic cascade for the regulation of glutamine synthetase activity?

Accepted Answer

This allows fine-tuning and am

Question 7

What is enzyme multiplicity?

Accepted Answer

This is a strategy for regulation in whi

Question 8

In comparing transaminase enzymes,certain amino acids have been conserved.What are these amino acids,and how are they important in determining the proper chirality of the new amino acid?

Accepted Answer

Both a lysine and an arginine are conser

Exam 24: The Biosynthesis of Amino Acids

Glutamine synthetase adds NH3 to _______________ to make glutamine.

What molecule is the precursor for the biosynthesis of serine,cysteine,and glycine?

Tryptophan is a precursor for the neurotransmitter(s)

Which of the following is a tripeptide that functions as an antioxidant?

Organisms capable of carrying out reduction of atmospheric nitrogen include

What is the advantage of the enzymatic cascade for the regulation of glutamine synthetase activity?

What is enzyme multiplicity?

In comparing transaminase enzymes,certain amino acids have been conserved.What are these amino acids,and how are they important in determining the proper chirality of the new amino acid?

Biochemistry: An Evolving Science

Protein Composition and Structure

Exploring Proteins and Proteomes

DNA, RNA, and the Flow of Genetic Information

Exploring Genes and Genomes

Exploring Evolution and Bioinformatics

Hemoglobin: a Portrait of a Protein in Action

Enzymes: Basic Concepts and Kinetics

Catalytic Strategies

Regulatory Strategies

Carbohydrates

Lipids and Cell Membranes

Membrane Channels and Pumps

Signal-Transduction Pathways

Metabolism: Basic Concepts and Design

Glycolysis and Gluconeogenesis

The Citric Acid Cycle

Oxidative Phosphorylation

The Light Reactions of Photosynthesis

The Calvin Cycle and the Pentose Phosphate Pathway

Glycogen Metabolism

Fatty Acid Metabolism

Protein Turnover and Amino Acid Catabolism

Nucleotide Biosynthesis

Biosynthesis of Membrane Lipids and Steroids

The Integration of Metabolism

DNA Replication, repair, and Recombination

RNA Synthesis and Processing

Protein Synthesis

The Control of Gene Expression in Prokaryotes

The Control of Gene Expression in Eukaryotes

Sensory Systems

The Immune System

Molecular Motors

Drug Development

Filters

Glutamine synthetase adds NH₃ to _______________ to make glutamine.