Question 1

The gene of an operon that codes for a protein repressor is called the

Accepted Answer

A) Operator 
B) Structural locus 
C) Regulator 
D) Promoter 
E) None of the choices are correct 
A) Operator 
B) Structural locus 
C) Regulator 
D) Promoter 
E) None of the choices are correct C

Question 2

Excised introns form structures called lariats.

Accepted Answer

A) True 
 B)False  True

Question 3

The expression of genetic traits is the

Accepted Answer

A) Genome 
B) Genotype 
C) Proteome 
D) Phenotype 
E) Proteotype 
A) Genome 
B) Genotype 
C) Proteome 
D) Phenotype 
E) Proteotype D

Question 4

All mutations are harmful to the cell.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following is not associated with a prokaryotic ribosome?

Accepted Answer

A) Is a 70s 
B) Has a peptide (P) site 
C) Has an exit site 
D) Small unit provides the enzymes for making peptide bonds 
E) Has an amino acid (
A)  site 
A) Is a 70s 
B) Has a peptide (P) site 
C) Has an exit site 
D) Small unit provides the enzymes for making peptide bonds 
E) Has an amino acid (
A)  site

Question 6

A primer 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 7

The site where the old DNA strands separate and new DNA strands will be synthesized is called the

Accepted Answer

A) Primer 
B) Okazaki fragment 
C) Template 
D) Rolling circle 
E) Replication fork 
A) Primer 
B) Okazaki fragment 
C) Template 
D) Rolling circle 
E) Replication fork

Question 8

A sequence of bases on a gene that does not code for protein is called a/an

Accepted Answer

A) Promoter 
B) Operator 
C) Operon 
D) Exon 
E) Intron 
A) Promoter 
B) Operator 
C) Operon 
D) Exon 
E) Intron

Question 9

Which of the following is not true of transposons?

Accepted Answer

A) Can change pigmentation 
B) Can replace damaged DNA 
C) Can transfer drug resistance 
D) Can change the genome 
E) Are always part of plasmids 
A) Can change pigmentation 
B) Can replace damaged DNA 
C) Can transfer drug resistance 
D) Can change the genome 
E) Are always part of plasmids

Question 10

Induced mutations result from errors in DNA replication.

Accepted Answer

A) True 
 B)False

Question 11

Synthesis of a repressible enzyme is inhibited by

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 
E) None of the choices are correct 
A) Repressor alone bound to operator 
B) Substrate bound to repressor 
C) Substrate bound to promoter 
D) Corepressor and repressor binding to operator 
E) None of the choices are correct

Question 12

The enzyme that can proofreads replicating DNA, detects incorrect bases, excises them, and correctly replaces 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 13

If a codon for alanine is GCA, then the anticodon is

Accepted Answer

A) GCA 
B) CGT 
C) ACG 
D) CGU 
E) UGC 
A) GCA 
B) CGT 
C) ACG 
D) CGU 
E) UGC

Question 14

Which of the following is not true of an organism's genotype?

Accepted Answer

A) Is inherited 
B) Are structural genes coding for proteins 
C) Are genes coding for RNA 
D) Are regulatory genes controlling gene expression 
E) Are the expressed traits governed by the genes 
A) Is inherited 
B) Are structural genes coding for proteins 
C) Are genes coding for RNA 
D) Are regulatory genes controlling gene expression 
E) Are the expressed traits governed by the genes

Question 15

In bacteria, initiator tRNA carries formyl methionine.

Accepted Answer

A) True 
 B)False

Question 16

Which is incorrect about inducible operons?

Accepted Answer

A) Have genes turned off by a buildup of end product 
B) Are often for catabolic pathways 
C) Are normally turned off 
D) Are turned on by the substrate of the enzyme 
E) Include the lac operon 
A) Have genes turned off by a buildup of end product 
B) Are often for catabolic pathways 
C) Are normally turned off 
D) Are turned on by the substrate of the enzyme 
E) Include the lac operon

Question 17

During replication, each parent DNA strand serves as a _____ for synthesis of new DNA strands.

Accepted Answer

A) Copy point 
B) Template 
C) Comparison molecule 
D) Scaffold 
E) Reservoir 
A) Copy point 
B) Template 
C) Comparison molecule 
D) Scaffold 
E) Reservoir

Question 18

DNA polymerase III

Accepted Answer

A) Is needed for adding nucleotides during mRNA synthesis 
B) Synthesizes new DNA only in the 5' to 3' direction 
C) Cannot add nucleotides to the lagging strand 
D) Synthesizes an RNA primer 
E) All of the choices are correct 
A) Is needed for adding nucleotides during mRNA synthesis 
B) Synthesizes new DNA only in the 5' to 3' direction 
C) Cannot add nucleotides to the lagging strand 
D) Synthesizes an RNA primer 
E) All of the choices are correct

Question 19

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 20

DNA gyrase

Accepted Answer

A) Unwinds DNA 
B) Supercoils DNA 
C) Cleaves DNA 
D) Joins free DNA ends 
E) None of the choices are correct 
A) Unwinds DNA 
B) Supercoils DNA 
C) Cleaves DNA 
D) Joins free DNA ends 
E) None of the choices are correct

Exam 9: An Introduction to Microbial Genetics

The gene of an operon that codes for a protein repressor is called the

Excised introns form structures called lariats.

The expression of genetic traits is the

All mutations are harmful to the cell.

Which of the following is not associated with a prokaryotic ribosome?

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

The site where the old DNA strands separate and new DNA strands will be synthesized is called the

A sequence of bases on a gene that does not code for protein is called a/an

Which of the following is not true of transposons?

Induced mutations result from errors in DNA replication.

Synthesis of a repressible enzyme is inhibited by

The enzyme that can proofreads replicating DNA, detects incorrect bases, excises them, and correctly replaces them is

If a codon for alanine is GCA, then the anticodon is

Which of the following is not true of an organism's genotype?

In bacteria, initiator tRNA carries formyl methionine.

Which is incorrect about inducible operons?

During replication, each parent DNA strand serves as a _____ for synthesis of new DNA strands.

DNA polymerase III

DNA Polymerase III

DNA gyrase

The Main Themes of Microbiology

The Chemistry of Biology

Tools of the Laboratory: Methods of Studying Microorganisms

A Survey of Prokaryotic Cells and Microorganisms

A Survey of Eukaryotic Cells and Microorganisms

An Introduction to Viruses

Microbial Nutrition, Ecology, and Growth

An Introduction to Microbial Metabolism: the Chemical Crossroads of Life

Genetic Engineering: a Revolution in Molecular Biology

Physical and Chemical Agents for Microbial Control

Drugs, Microbes, Host-The Elements of Chemotherapy

Microbe-Human Interactions: Infection, Disease, and Epidemiology

An Introduction to Host Defenses and Innate Immunities

Adaptive, Specific Immunity and Immunization

Disorders in Immunity

Procedures for Identifying Pathogens and Diagnosing Infections

The Gram-Positive and Gram-Negative Cocci of Medical Importance

The Gram-Positive Bacilli of Medical Importance

The Gram-Negative Bacilli of Medical Importance

Miscellaneous Bacterial Agents of Disease

The Fungi of Medical Importance

The Parasites of Medical Importance

Introduction to Viruses That Infect Humans: the Dna Viruses

The Rna Viruses That Infect Humans

Environmental Microbiology

Applied and Industrial Microbiology

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