Question 1

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 E

Question 2

The most damaging type of mutation is a

Accepted Answer

A) point mutation. 
B) silent mutation. 
C) frameshift mutation. 
D) back mutation. 
E) All the choices are equally damaging. 
A) point mutation. 
B) silent mutation. 
C) frameshift mutation. 
D) back mutation. 
E) All the choices are equally damaging. C

Question 3

Which of the following is incorrect about transfer RNA?

Accepted Answer

A) has a bottom hairpin loop with an anticodon 
B) An anticodon is complementary to a codon. 
C) contains a binding site for an amino acid 
D) The initiator tRNA that binds to the P site has the anticodon UAC. 
E) Initiator tRNA in bacteria carries tryptophan. 
A) has a bottom hairpin loop with an anticodon 
B) An anticodon is complementary to a codon. 
C) contains a binding site for an amino acid 
D) The initiator tRNA that binds to the P site has the anticodon UAC. 
E) Initiator tRNA in bacteria carries tryptophan. E

Question 4

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 5

If the wild type DNA sequence reads THE CAT ATE THE BIG RAT, what type of mutation would change the sequence to THE CAT ATE THE BAG RAT?

Accepted Answer

A) missense 
B) nonsense 
C) insertion 
D) deletion 
E) silent 
A) missense 
B) nonsense 
C) insertion 
D) deletion 
E) silent

Question 6

The RNA molecules that carry amino acids to the ribosomes during protein synthesis are called

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 7

The DNA of microorganisms is made up of subunits called

Accepted Answer

A) histones. 
B) amino acids. 
C) nucleotides. 
D) mRNA. 
E) polymerases. 
A) histones. 
B) amino acids. 
C) nucleotides. 
D) mRNA. 
E) polymerases.

Question 8

Which is incorrect about inducible operons?

Accepted Answer

A) have genes turned off by a buildup of end product 
B) often encode enzymes 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) often encode enzymes for catabolic pathways 
C) are normally turned off 
D) are turned on by the substrate of the enzyme 
E) include the lac operon

Question 9

RNA molecules differ from DNA molecules because only RNA

Accepted Answer

A) has ribose. 
B) has uracil. 
C) is typically one strand of nucleotides. 
D) does not have thymine. 
E) All of these choices are correct. 
A) has ribose. 
B) has uracil. 
C) is typically one strand of nucleotides. 
D) does not have thymine. 
E) All of these choices are correct.

Question 10

In bacteria, initiator tRNA carries formyl methionine.

Accepted Answer

A) True 
 B)False

Question 11

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 12

Lactose is a corepressor in the lac operon.

Accepted Answer

A) True 
 B)False

Question 13

Repressible operons require that _____ bind to the repressor protein before it can bind to the operator.

Accepted Answer

A) the product 
B) a cofactor 
C) a coenzyme 
D) the substrate 
E) the reactant 
A) the product 
B) a cofactor 
C) a coenzyme 
D) the substrate 
E) the reactant

Question 14

DNA replication proceeds in one direction around the bacterial chromosome.

Accepted Answer

A) True 
 B)False

Question 15

The process in which mutations are removed and replaced with the correct bases is called

Accepted Answer

A) transduction. 
B) excision repair. 
C) frameshift. 
D) back mutation. 
E) transformation. 
A) transduction. 
B) excision repair. 
C) frameshift. 
D) back mutation. 
E) transformation.

Question 16

Each _____ is a specific segment of the DNA with the code for production of one functional product.

Accepted Answer

A) intron 
B) exon 
C) gene 
D) operator 
E) triplet 
A) intron 
B) exon 
C) gene 
D) operator 
E) triplet

Question 17

The three-base sequence on DNA that codes for an amino acid is called a(n)

Accepted Answer

A) codon. 
B) exon. 
C) anticodon. 
D) intron. 
E) triplet. 
A) codon. 
B) exon. 
C) anticodon. 
D) intron. 
E) triplet.

Question 18

DNA polymerase I

Accepted Answer

A) removes primers. 
B) adds bases to new DNA chain. 
C) seals DNA gaps. 
D) proofreads DNA chain. 
E) All of these choices are correct, 
A) removes primers. 
B) adds bases to new DNA chain. 
C) seals DNA gaps. 
D) proofreads DNA chain. 
E) All of these choices are correct,

Question 19

Replication of DNA begins at a(n)

Accepted Answer

A) guanine-cytosine rich area. 
B) uracil-adenine rich area. 
C) adenine-thymine rich area. 
D) adenine-cytosine rich area. 
E) guanine-adenine rich area. 
A) guanine-cytosine rich area. 
B) uracil-adenine rich area. 
C) adenine-thymine rich area. 
D) adenine-cytosine rich area. 
E) guanine-adenine rich area.

Question 20

Which of the following is incorrect about termination codons?

Accepted Answer

A) They are also called nonsense codons. 
B) They occur where the bond between the final tRNA and the growing polypeptide is broken. 
C) Termination codons include AUG. 
D) Termination codons include UAA, UAG, UGA. 
E) Termination codons do not have corresponding tRNA. 
A) They are also called nonsense codons. 
B) They occur where the bond between the final tRNA and the growing polypeptide is broken. 
C) Termination codons include AUG. 
D) Termination codons include UAA, UAG, UGA. 
E) Termination codons do not have corresponding tRNA.

Exam 9: Microbial Genetics

Which of the following is not true of transposons?

The most damaging type of mutation is a

Which of the following is incorrect about transfer RNA?

The duplication of a cell's DNA is called

If the wild type DNA sequence reads THE CAT ATE THE BIG RAT, what type of mutation would change the sequence to THE CAT ATE THE BAG RAT?

The RNA molecules that carry amino acids to the ribosomes during protein synthesis are called

The DNA of microorganisms is made up of subunits called

Which is incorrect about inducible operons?

RNA molecules differ from DNA molecules because only RNA

In bacteria, initiator tRNA carries formyl methionine.

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

Lactose is a corepressor in the lac operon.

Repressible operons require that _____ bind to the repressor protein before it can bind to the operator.

DNA replication proceeds in one direction around the bacterial chromosome.

The process in which mutations are removed and replaced with the correct bases is called

Each _____ is a specific segment of the DNA with the code for production of one functional product.

The three-base sequence on DNA that codes for an amino acid is called a(n)

DNA polymerase I

Replication of DNA begins at a(n)

Which of the following is incorrect about termination codons?

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 and Disease

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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