Question 1

How many hydrogen bonds exist between the cytosine/guanine base pairs?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 2

Which of the following metal ions complexes with cellular ATP to neutralize some of its negative charges at the active site of an enzyme in order that nucleophilic substitution reactions proceed rapidly?

Accepted Answer

A) manganese 
B) iron 
C) cobalt 
D) magnesium 
E) calcium 
A) manganese 
B) iron 
C) cobalt 
D) magnesium 
E) calcium

Question 3

Give the first step of PCR.

Accepted Answer

A) esterification 
B) strand separation 
C) base-pairing of the primers 
D) DNA synthesis 
E) hydrolysis 
A) esterification 
B) strand separation 
C) base-pairing of the primers 
D) DNA synthesis 
E) hydrolysis

Question 4

Name the two purine bases which serve as components in ribonucleosides.

Accepted Answer

The answer of Name the two purine bases which serve...

Question 5

In which of the following helical forms does DNA in living organisms mainly exist?

Accepted Answer

A) Z-helix 
B) a-helix 
C) b-helix 
D) B and C 
E) A, B and C 
A) Z-helix 
B) a-helix 
C) b-helix 
D) B and C 
E) A, B and C

Question 6

What are antigene and antisense agents?

Accepted Answer

They are synthetic polymers that bind to

Question 7

What is the composition of a ribosome?

Accepted Answer

A) 40% protein, 60% rRNA 
B) 60% protein, 40% tRNA 
C) 40% protein, 60% tRNA 
D) 40% protein, 60% mRNA 
E) 100% protein, 0% rRNA 
A) 40% protein, 60% rRNA 
B) 60% protein, 40% tRNA 
C) 40% protein, 60% tRNA 
D) 40% protein, 60% mRNA 
E) 100% protein, 0% rRNA

Question 8

Which of the following reaction sequences best describes the formation of the nucleic acid in the biosynthesis of DNA?

Accepted Answer

A) nucleophilic attack of a 5'-OH group of one nucleotide on the β-phosphorus of another 
B) nucleophilic attack of a 5'-OH group of one nucleotide on the α-phosphorus of another 
C) nucleophilic attack of a 3'-OH group of a nucleotide on the γ-phosphorus of another 
D) nucleophilic attack of a 3'-OH group of one nucleotide on the β-phosphorus of another 
E) nucleophilic attack of a 3'-OH group of one nucleotide on the α-phosphorus of another 
A) nucleophilic attack of a 5'-OH group of one nucleotide on the β-phosphorus of another 
B) nucleophilic attack of a 5'-OH group of one nucleotide on the α-phosphorus of another 
C) nucleophilic attack of a 3'-OH group of a nucleotide on the γ-phosphorus of another 
D) nucleophilic attack of a 3'-OH group of one nucleotide on the β-phosphorus of another 
E) nucleophilic attack of a 3'-OH group of one nucleotide on the α-phosphorus of another

Question 9

Which of the following statements best describes the meaning of transcription?

Accepted Answer

A) It is the synthesis of rRNA from a DNA blueprint. 
B) It is synonymous with replication. 
C) It is the synthesis of identical copies from a DNA blueprint. 
D) It is the synthesis of mRNA from a DNA blueprint. 
E) It is the synthesis of tRNA from a DNA blueprint. 
A) It is the synthesis of rRNA from a DNA blueprint. 
B) It is synonymous with replication. 
C) It is the synthesis of identical copies from a DNA blueprint. 
D) It is the synthesis of mRNA from a DNA blueprint. 
E) It is the synthesis of tRNA from a DNA blueprint.

Question 10

Identify the type(s)of base pairing present in DNA.

Accepted Answer

A) adenine and thymine 
B) cytosine and guanine 
C) cytosine and thymine 
D) adenine and uracil 
E) thymine and adenine 
A) adenine and thymine 
B) cytosine and guanine 
C) cytosine and thymine 
D) adenine and uracil 
E) thymine and adenine

Question 11

Which of the following is the proper name of the nucleoside made from adenine and found in DNA?

Accepted Answer

A) adenosine 
B) 2'-deoxyadenosine 
C) 2-deoxyadenosine 
D) 2'-oxyadenosine 
E) 2'-deoxyadenine 
A) adenosine 
B) 2'-deoxyadenosine 
C) 2-deoxyadenosine 
D) 2'-oxyadenosine 
E) 2'-deoxyadenine

Question 12

Give the order for base pairing for the following strand. G-C-A-T-T-C-C-G-A-T

Accepted Answer

A) C-G-U-A-A-G-G-C-U-A 
B) U-G-T-A-A-G-G-U-T-U 
C) A-T-G-C-C-T-T-A-G-C 
D) T-A-C-G-G-A-A-T-C-G 
E) C-G-T-A-A-G-G-C-T-A 
A) C-G-U-A-A-G-G-C-U-A 
B) U-G-T-A-A-G-G-U-T-U 
C) A-T-G-C-C-T-T-A-G-C 
D) T-A-C-G-G-A-A-T-C-G 
E) C-G-T-A-A-G-G-C-T-A

Question 13

How many billion base pairs are there in the total DNA of a human cell?

Accepted Answer

A) 3 
B) 5 
C) 8 
D) 11 
E) 13 
A) 3 
B) 5 
C) 8 
D) 11 
E) 13

Question 14

Identify the structure.

Accepted Answer

A) uracil 
B) cytosine 
C) guanine 
D) thymine 
E) adenine 
A) uracil 
B) cytosine 
C) guanine 
D) thymine 
E) adenine

Question 15

Name the two pyrimidine bases which serve as components in deoxyribonucleotides.

Accepted Answer

cytosine a

Question 16

Draw the chemical structure of adenosine triphosphate, (ATP).

Accepted Answer

The answer of Draw the chemical structure of adenosine triphosphate,...

Question 17

Which of the following phosphate groups is found in nucleic acids?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 18

Draw the structure of ADP.

Accepted Answer

The answer of Draw the structure of ADP....

Question 19

Besides a possible difference in base structure, what is the major structural difference between ribo- and deoxyribonucleosides?

Accepted Answer

Deoxyribonucleosides

Question 20

Describe how RNA is easily cleaved.

Accepted Answer

The 2'-OH group of t

Exam 26: Nucleosides, Nucleotides, and Nucleic Acids

How many hydrogen bonds exist between the cytosine/guanine base pairs?

Which of the following metal ions complexes with cellular ATP to neutralize some of its negative charges at the active site of an enzyme in order that nucleophilic substitution reactions proceed rapidly?

Give the first step of PCR.

Name the two purine bases which serve as components in ribonucleosides.

In which of the following helical forms does DNA in living organisms mainly exist?

What are antigene and antisense agents?

What is the composition of a ribosome?

Which of the following reaction sequences best describes the formation of the nucleic acid in the biosynthesis of DNA?

Which of the following statements best describes the meaning of transcription?

Identify the type(s)of base pairing present in DNA.

Which of the following is the proper name of the nucleoside made from adenine and found in DNA?

Give the order for base pairing for the following strand. G-C-A-T-T-C-C-G-A-T

How many billion base pairs are there in the total DNA of a human cell?

Identify the structure.

Name the two pyrimidine bases which serve as components in deoxyribonucleotides.

Draw the chemical structure of adenosine triphosphate, (ATP).

Which of the following phosphate groups is found in nucleic acids?

Draw the structure of ADP.

Besides a possible difference in base structure, what is the major structural difference between ribo- and deoxyribonucleosides?

Describe how RNA is easily cleaved.

Remembering General Chemistry: Electronic Structure and Bonding

Acids and Bases: Central to Understanding Organic Chemistry

An Introduction to Organic Compounds

Isomers: the Arrangement of Atoms in Space

Alkenes Thermodynamics and Kinetics

Reactions of Alkenes

Reactions of Alkynes Introduction to Multistep Synthesis

Electron Delocalization, Resonance, and Aromaticity More About Molecular Orbital Theory

Substitution Reactions of Alkyl Halides

Elimination Reactions of Alkyl Halides Competition Between Substitution and Elimination

Reactions of Alcohols, Ethers, Epoxides, and Sulfur-Containing Compounds

Organometallic Compounds

Reactions of Alkanes, Radicals

Mass Spectrometry, Infrared Spectroscopy, and Uvvis Spectroscopy

Nmr Spectroscopy

Reactions of Carboxylic Acids and Carboxylic Acid Derivatives

Reactions of Aldehydes and Ketones

Reactions at the Alpha Carbon of Carbonyl Compounds

Reactions of Benzene and Substituted Benzenes

More About Amines Heterocylic Compounds

Carbohydrates

Amino Acids, Peptides, and Proteins

Catalysis

The Organic Mechanisms of the Coenzymes

The Chemistry of Metabolism

Synthetic Polymers

Pericyclic Reactions

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