Question 1

All of the following pertain to nitrogenous bases except

Accepted Answer

A) form pairs by hydrogen bonding. 
B) guanine pairs with uracil. 
C) adenine pairs with thymine. 
D) cytosine and thymine are pyrimidines. 
E) allows variation from one nucleotide to another which creates the encoded information. 
A) form pairs by hydrogen bonding. 
B) guanine pairs with uracil. 
C) adenine pairs with thymine. 
D) cytosine and thymine are pyrimidines. 
E) allows variation from one nucleotide to another which creates the encoded information. B

Question 2

Transcription occurs within the nucleus or at the nucleoid.

Accepted Answer

A) True 
 B)False  True

Question 3

The enzyme that helps pack DNA into the cell by coiling the DNA into a tight bundle is

Accepted Answer

A) DNA ligase. 
B) DNA polymerase. 
C) DNA helicase. 
D) DNA gyrase. 
E) primase. 
A) DNA ligase. 
B) DNA polymerase. 
C) DNA helicase. 
D) DNA gyrase. 
E) primase. D

Question 4

A permanent,inheritable change in the genetic information is called a/n

Accepted Answer

A) translation. 
B) transcription. 
C) mutation. 
D) alteration. 
E) regeneration. 
A) translation. 
B) transcription. 
C) mutation. 
D) alteration. 
E) regeneration.

Question 5

A nucleosome is a linear chromosome wound around the

Accepted Answer

A) nuclear membrane. 
B) rRNA. 
C) mRNA. 
D) histone. 
E) nucleolus. 
A) nuclear membrane. 
B) rRNA. 
C) mRNA. 
D) histone. 
E) nucleolus.

Question 6

A bacteriophage transfers a random fragment of DNA of the previous host to the current host.This is an example of

Accepted Answer

A) conjugation. 
B) generalized transduction. 
C) specialized transduction. 
D) creation of an Hfr cell. 
A) conjugation. 
B) generalized transduction. 
C) specialized transduction. 
D) creation of an Hfr cell.

Question 7

Looking at your results of the Ames test,using bacteriological agar medium plates lacking the amino acid histidine,you find that there are many colonies growing on the agar.Your interpretation of this result is:

Accepted Answer

A) the bacterium has turned its operon genes on,producing proteins necessary for growth. 
B) the chemical being tested is mutagenic. 
C) the bacterium does not have any plasmids,so it cannot grow on the medium. 
D) the drug being tested has no inhibitory effect on the bacterium,therefore it is not a good antibiotic to give for treatment of disease. 
A) the bacterium has turned its operon genes on,producing proteins necessary for growth. 
B) the chemical being tested is mutagenic. 
C) the bacterium does not have any plasmids,so it cannot grow on the medium. 
D) the drug being tested has no inhibitory effect on the bacterium,therefore it is not a good antibiotic to give for treatment of disease.

Question 8

Which of the following is not a type of microRNA?

Accepted Answer

A) tRNA 
B) miRNA 
C) antisense RNA 
D) riboswitch 
E) siRNA 
A) tRNA 
B) miRNA 
C) antisense RNA 
D) riboswitch 
E) siRNA

Question 9

DNA gyrase

Accepted Answer

A) unwinds DNA. 
B) supercoils DNA. 
C) cleaves DNA. 
D) joins free DNA ends. 
A) unwinds DNA. 
B) supercoils DNA. 
C) cleaves DNA. 
D) joins free DNA ends.

Question 10

Full induction of the lactose operon requires

Accepted Answer

A) lactose present. 
B) lactose and glucose present. 
C) lactose present without glucose. 
D) lactose and arabinose present. 
A) lactose present. 
B) lactose and glucose present. 
C) lactose present without glucose. 
D) lactose and arabinose present.

Question 11

Synthesis of an inducible enzyme requires

Accepted Answer

A) repressor alone bound to operator. 
B) substrate bound to repressor. 
C) substrate bound to promoter. 
D) corepressor and repressor binding to operator. 
A) repressor alone bound to operator. 
B) substrate bound to repressor. 
C) substrate bound to promoter. 
D) corepressor and repressor binding to operator.

Question 12

Semiconservative replication refers to

Accepted Answer

A) each base bonding at the 1' position of the sugar. 
B) a purine always bonding to a pyrimidine. 
C) one helix strand that runs from the 5' to 3' direction and the other strand that runs from the 3' to 5' direction. 
D) an original parent DNA strand and one newly synthesized DNA strand comprising a new DNA molecule. 
A) each base bonding at the 1' position of the sugar. 
B) a purine always bonding to a pyrimidine. 
C) one helix strand that runs from the 5' to 3' direction and the other strand that runs from the 3' to 5' direction. 
D) an original parent DNA strand and one newly synthesized DNA strand comprising a new DNA molecule.

Question 13

DNA Polymerase III

Accepted Answer

A) synthesizes primer. 
B) removes primer. 
C) joins Okazaki fragments. 
D) unzips the DNA helix. 
E) proofreads new DNA. 
A) synthesizes primer. 
B) removes primer. 
C) joins Okazaki fragments. 
D) unzips the DNA helix. 
E) proofreads new DNA.

Question 14

The nontranscribed region of DNA to which RNA polymerase binds to initiate transcription is called the

Accepted Answer

A) promoter. 
B) operator. 
C) operon. 
D) exon. 
E) intron. 
A) promoter. 
B) operator. 
C) operon. 
D) exon. 
E) intron.

Question 15

The development of virulent,toxin-producing bacterial strains due to the presence of a temperate phage can occur through the process of:

Accepted Answer

A) bacterial conjugation. 
B) transformation. 
C) generalized transduction. 
D) specialized transduction. 
A) bacterial conjugation. 
B) transformation. 
C) generalized transduction. 
D) specialized transduction.

Question 16

The duplication of a cell's DNA is called

Accepted Answer

A) mitosis. 
B) replication. 
C) transcription. 
D) translation. 
E) mutation. 
A) mitosis. 
B) replication. 
C) transcription. 
D) translation. 
E) mutation.

Question 17

The enzyme that can proofread replicating DNA,detect incorrect bases,excise them,and correctly replace them is

Accepted Answer

A) DNA ligase. 
B) DNA polymerase. 
C) DNA helicase. 
D) DNA gyrase. 
E) primase. 
A) DNA ligase. 
B) DNA polymerase. 
C) DNA helicase. 
D) DNA gyrase. 
E) primase.

Question 18

A primer comprised of ____ is needed at the origin of nucleotide addition.

Accepted Answer

A) polymerase III 
B) polymerase I 
C) helicase 
D) RNA 
E) DNA 
A) polymerase III 
B) polymerase I 
C) helicase 
D) RNA 
E) DNA

Question 19

This molecule is translated into an amino acid sequence:

Accepted Answer

A) ribosomal RNA 
B) messenger RNA 
C) transfer RNA 
D) primer RNA 
E) ribozymes 
A) ribosomal RNA 
B) messenger RNA 
C) transfer RNA 
D) primer RNA 
E) ribozymes

Question 20

Helicase

Accepted Answer

A) unwinds DNA. 
B) supercoils DNA. 
C) unwinds RNA. 
D) winds RNA. 
A) unwinds DNA. 
B) supercoils DNA. 
C) unwinds RNA. 
D) winds RNA.

Exam 9: Microbial Genetics

All of the following pertain to nitrogenous bases except

Transcription occurs within the nucleus or at the nucleoid.

The enzyme that helps pack DNA into the cell by coiling the DNA into a tight bundle is

A permanent,inheritable change in the genetic information is called a/n

A nucleosome is a linear chromosome wound around the

A bacteriophage transfers a random fragment of DNA of the previous host to the current host.This is an example of

Looking at your results of the Ames test,using bacteriological agar medium plates lacking the amino acid histidine,you find that there are many colonies growing on the agar.Your interpretation of this result is:

Which of the following is not a type of microRNA?

DNA gyrase

Full induction of the lactose operon requires

Synthesis of an inducible enzyme requires

Semiconservative replication refers to

DNA Polymerase III

The nontranscribed region of DNA to which RNA polymerase binds to initiate transcription is called the

The development of virulent,toxin-producing bacterial strains due to the presence of a temperate phage can occur through the process of:

The duplication of a cell's DNA is called

The enzyme that can proofread replicating DNA,detect incorrect bases,excise them,and correctly replace them is

A primer comprised of ____ is needed at the origin of nucleotide addition.

This molecule is translated into an amino acid sequence:

Helicase

The Main Themes of Microbiology

The Chemistry of Biology

Tools of the Laboratory: Methods for the Culturing of Microscopic Analysis of Microorganisms

Prokaryotic Profiles: The Bacteria and Archaea

Eukaryotic Cells and Microorganisms

An Introduction to the Viruses

Microbial Nutrition, Ecology, and Growth

Microbial Metabolism: the Chemical Crossroads of Life

Genetic Engineering and Recombinant Dna

Physical and Chemical Control of Microbes

Drugs, Microbes, host-The Elements of Chemotherapy

Microbe-Human Interactions: Infection and Disease

Host Defenses I: Overview and Nonspecific Defenses

Host Defenses II: Specific Immunity and Immunization

Disorders in Immunity

Diagnosing Infections

Infectious Diseases Affecting the Skin and Eyes

Infectious Diseases Affecting the Nervous System

Infectious Diseases Affecting the Cardiovascular and Lymphatic Systems

Infectious Diseases Affecting the Respiratory System

Infectious Diseases Affecting the Gastrointestinal Tract

Infectious Diseases Affecting the Genitourinary System

Microbes and the Environment

Applied Microbiology and Food and Water Safety

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