Question 1

Which vitamin supplement is taken during the first trimester of pregnancy to prevent the birth defect known as spina bifida?

Accepted Answer

Spina bifida is characterized by the inc

Question 2

Scaffolds for the ring systems in nucleotides are from the amino acids glycine and __________________.

Accepted Answer

The answer of Scaffolds for the ring systems in nucleotides...

Question 3

Choose the correct answer from the list below. Not all of the answers will be used.
-A purine or pyrimidine base linked to a sugar is a(n) _________________.

Accepted Answer

A) de novo 
B) xanthylate 
C) riboflavin 
D) amino acids 
E) UTP
F)N5, N10-methylenetetrahydrofolate
G)nucleotide
H)gout
I)nucleoside
J)ATP
K)urate
L)salvage 
A) de novo 
B) xanthylate 
C) riboflavin 
D) amino acids 
E) UTP
F)N5, N10-methylenetetrahydrofolate
G)nucleotide
H)gout
I)nucleoside
J)ATP
K)urate
L)salvage

Question 4

How many ATP molecules are necessary to make carbamoyl phosphate by carbamoyl phosphate synthetase (CPS)?

Accepted Answer

A)  1 
B)  4 
C)  2 
D)  3 
E)  None of the above. 
A)  1 
B)  4 
C)  2 
D)  3 
E)  None of the above.

Question 5

Which enzyme(s) catalyze(s) the first step in de novo nucleotide biosynthesis?

Accepted Answer

A)  aspartate transcarbamylase 
B)  nucleoside monophosphate kinase 
C)  glutamine phosphoribosyl amidotransferase 
D)  A and B 
E)  A and C 
A)  aspartate transcarbamylase 
B)  nucleoside monophosphate kinase 
C)  glutamine phosphoribosyl amidotransferase 
D)  A and B 
E)  A and C

Question 6

What is the disadvantage of methotrexate as a therapeutic agent?

Accepted Answer

Methotrexate kills all rapidly growing c

Question 7

Both de novo and salvage paths are used in the synthesis of:

Accepted Answer

A)  ribonucleotides. 
B)  deoxyribonucleotides. 
C)  dideoxyribonucleotides. 
D)  All of the above. 
E)  None of the above. 
A)  ribonucleotides. 
B)  deoxyribonucleotides. 
C)  dideoxyribonucleotides. 
D)  All of the above. 
E)  None of the above.

Question 8

In de novo synthesis, the pyrimidine ring is assembled using:

Accepted Answer

A)  bicarbonate. 
B)  aspartate. 
C)  glutamine. 
D)  A and B. 
E)  A, B, and C. 
A)  bicarbonate. 
B)  aspartate. 
C)  glutamine. 
D)  A and B. 
E)  A, B, and C.

Exam 32: Nucleotide Metabolism

Which vitamin supplement is taken during the first trimester of pregnancy to prevent the birth defect known as spina bifida?

Scaffolds for the ring systems in nucleotides are from the amino acids glycine and __________________.

Choose the correct answer from the list below. Not all of the answers will be used. -A purine or pyrimidine base linked to a sugar is a(n) _________________.

How many ATP molecules are necessary to make carbamoyl phosphate by carbamoyl phosphate synthetase (CPS)?

Which enzyme(s) catalyze(s) the first step in de novo nucleotide biosynthesis?

What is the disadvantage of methotrexate as a therapeutic agent?

Both de novo and salvage paths are used in the synthesis of:

In de novo synthesis, the pyrimidine ring is assembled using:

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

Amino Acids Synthesis

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

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