Question 1

DNA synthesis is often measured by using radioactive

Accepted Answer

A)  biotin. 
B)  thymine. 
C)  thiamine. 
D)  thymidine. 
E)  All of the above 
A)  biotin. 
B)  thymine. 
C)  thiamine. 
D)  thymidine. 
E)  All of the above

Question 2

The purine ring system is shown below. What is the source of the nitrogen atoms 3 and 9 during the de novo biosynthesis of purines?

Accepted Answer

A)  aspartate 
B)  glycine 
C)  arginine 
D)  glutamine 
A)  aspartate 
B)  glycine 
C)  arginine 
D)  glutamine

Question 3

What is unusual about the reaction catalyzed by ribonucleotide reductase?

Accepted Answer

A)  It involves the conversion of -SH groups to -OH groups. 
B)  It uses a rare derivative of tetrahydrofolate. 
C)  It has a free radical mechanism. 
D)  This enzyme and its reaction occur only in a few species of archaebacteria. 
A)  It involves the conversion of -SH groups to -OH groups. 
B)  It uses a rare derivative of tetrahydrofolate. 
C)  It has a free radical mechanism. 
D)  This enzyme and its reaction occur only in a few species of archaebacteria.

Question 4

Virtually all organisms and tissues can synthesize nucleotides.

Accepted Answer

A) True 
 B)False

Question 5

When a purine or a purine triphosphate is bound to the specificity site of ribonucleotide reductase, the activity of the catalytic site of the enzyme is specific for a pyrimidine or a pyrimidine triphosphate.

Accepted Answer

A) True 
 B)False

DNA synthesis is often measured by using radioactive

The purine ring system is shown below. What is the source of the nitrogen atoms 3 and 9 during the de novo biosynthesis of purines?

What is unusual about the reaction catalyzed by ribonucleotide reductase?

Virtually all organisms and tissues can synthesize nucleotides.

When a purine or a purine triphosphate is bound to the specificity site of ribonucleotide reductase, the activity of the catalytic site of the enzyme is specific for a pyrimidine or a pyrimidine triphosphate.

Introduction to Biochemistry

Water

Amino Acids and the Primary Structures of Proteins

Proteins: Three-Dimensional Structure and Function

Properties of Enzymes

Mechanisms of Enzymes

Coenzymes and Vitamins

Carbohydrates

Lipids and Membranes

Introduction to Metabolism

Glycolysis

Gluconeogenesis, the Pentose Phosphate Pathway, and Glycogen Metabolism

The Citric Acid Cycle

Electron Transport and Oxidative Phosphorylation

Photosynthesis

Lipid Metabolism

Amino Acid Metabolism

Nucleic Acids

Dna Replication, Repair, and Recombination

Transcription and Rna Processing

Protein Synthesis

Recombinant Dna Technology

Filters

Exam 18: Nucleotide Metabolism

DNA synthesis is often measured by using radioactive

The purine ring system is shown below. What is the source of the nitrogen atoms 3 and 9 during the de novo biosynthesis of purines?

What is unusual about the reaction catalyzed by ribonucleotide reductase?

Virtually all organisms and tissues can synthesize nucleotides.

When a purine or a purine triphosphate is bound to the specificity site of ribonucleotide reductase, the activity of the catalytic site of the enzyme is specific for a pyrimidine or a pyrimidine triphosphate.

Introduction to Biochemistry

Water

Amino Acids and the Primary Structures of Proteins

Proteins: Three-Dimensional Structure and Function

Properties of Enzymes

Mechanisms of Enzymes

Coenzymes and Vitamins

Carbohydrates

Lipids and Membranes

Introduction to Metabolism

Glycolysis

Gluconeogenesis, the Pentose Phosphate Pathway, and Glycogen Metabolism

The Citric Acid Cycle

Electron Transport and Oxidative Phosphorylation

Photosynthesis

Lipid Metabolism

Amino Acid Metabolism

Nucleic Acids

Dna Replication, Repair, and Recombination

Transcription and Rna Processing

Protein Synthesis

Recombinant Dna Technology

Filters