Question 1

Operons that code for anabolic enzyme systems are typically regulated by inducers.

Accepted Answer

A) True 
 B)False  False

Question 2

How many promoters are in an operon?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  Depends on how many genes there are in the operon 
A)  1 
B)  2 
C)  3 
D)  Depends on how many genes there are in the operon A

Question 3

Antisense RNA does which of the following?

Accepted Answer

A)  Inhibits the formation of the open complex in transcription 
B)  Occupies the A and P sites of the ribosome 
C)  Binds to the mRNA and prevents translation 
D)  Prevents the correct folding of a newly formed peptide 
A)  Inhibits the formation of the open complex in transcription 
B)  Occupies the A and P sites of the ribosome 
C)  Binds to the mRNA and prevents translation 
D)  Prevents the correct folding of a newly formed peptide C

Question 4

CAP affects which operon(s)?

Accepted Answer

A)  Ara 
B)  Trp 
C)  All of the answers are correct 
D)  None of the answers are correct 
A)  Ara 
B)  Trp 
C)  All of the answers are correct 
D)  None of the answers are correct

Question 5

A gene with a strong promoter would be under what type of control?

Accepted Answer

A)  Positive 
B)  Negative 
C)  The gene would be expressed constitutively 
D)  It depends on what the gene encodes 
A)  Positive 
B)  Negative 
C)  The gene would be expressed constitutively 
D)  It depends on what the gene encodes

Question 6

Which promoter(s) activate the cII gene?

Accepted Answer

A)  PL and PR 
B)  PR and PRE 
C)  PRM 
D)  PRM and PRE 
A)  PL and PR 
B)  PR and PRE 
C)  PRM 
D)  PRM and PRE

Question 7

Which of the following encode polycistronic mRNA?

Accepted Answer

A)  Lac operon 
B)  Ara operon 
C)  Trp operon 
D)  All of the answers are correct 
A)  Lac operon 
B)  Ara operon 
C)  Trp operon 
D)  All of the answers are correct

Question 8

Enzymes involved in metabolism are most likely regulated via ?

Accepted Answer

A)  Feedback inhibition 
B)  Acetylation 
C)  Methylation 
D)  None of the answers are correct 
A)  Feedback inhibition 
B)  Acetylation 
C)  Methylation 
D)  None of the answers are correct

Question 9

Negative transcriptional regulation is conducted by activator proteins.

Accepted Answer

A) True 
 B)False

Question 10

Regulation of gene expression may occur at which of the following levels?

Accepted Answer

A)  Transcription 
B)  Translation 
C)  Post translation 
D)  All of the answers are correct 
A)  Transcription 
B)  Translation 
C)  Post translation 
D)  All of the answers are correct

Question 11

In Jacob, Monod, and Pardee's experiment, how many functional copies of lacI were there in the merozygote?

Accepted Answer

A)  0 
B)  1 
C)  2 
D)  3 
A)  0 
B)  1 
C)  2 
D)  3

Question 12

What is the gene responsible for attenuation in the trp operon?

Accepted Answer

A)  trpL 
B)  trpR 
C)  trpD 
D)  trpC 
A)  trpL 
B)  trpR 
C)  trpD 
D)  trpC

Question 13

What would be the result if the U-rich sequence after the fourth stem loop in the trp operon was replaced by a UG-rich sequence?

Accepted Answer

A)  Attenuation would occur if tryptophan was high 
B)  Attenuation would occur if tryptophan is low 
C)  Attenuation would not occur if tryptophan was high 
D)  None of the answers are correct 
A)  Attenuation would occur if tryptophan was high 
B)  Attenuation would occur if tryptophan is low 
C)  Attenuation would not occur if tryptophan was high 
D)  None of the answers are correct

Question 14

Operons that code for catabolic enzyme systems are typically regulated by repressors.

Accepted Answer

A) True 
 B)False

Question 15

Which of the following is not an example of translational regulation in prokaryotes?

Accepted Answer

A)  Sterically blocking the ribosome 
B)  Phosphorylation of an enzyme 
C)  Incorporation of antisense RNA 
D)  Altering the structure of the mRNA 
A)  Sterically blocking the ribosome 
B)  Phosphorylation of an enzyme 
C)  Incorporation of antisense RNA 
D)  Altering the structure of the mRNA

Question 16

Translational regulatory proteins recognize specific areas of what molecule?

Accepted Answer

A)  tRNA 
B)  Ribosome 
C)  rRNA 
D)  mRNA 
E)  None of the answers are correct 
A)  tRNA 
B)  Ribosome 
C)  rRNA 
D)  mRNA 
E)  None of the answers are correct

Question 17

DNA that contains instructions for two or more structural genes produces monocistronic mRNA.
FALSE

Accepted Answer

A) True 
 B)False

Question 18

Constitutive genes are those that have constant levels of expression.

Accepted Answer

A) True 
 B)False

Question 19

In the lac operon, the operator is an example of a trans-effect genetic regulation.

Accepted Answer

A) True 
 B)False

Question 20

A temperate phage would be associated with which of the following viral life cycles?

Accepted Answer

A)  Lytic 
B)  Lysogenic 
C)  Both life cycles 
D)  Neither life cycle 
A)  Lytic 
B)  Lysogenic 
C)  Both life cycles 
D)  Neither life cycle

Exam 14: Gene Regulation in Bacteria and Bacteriophages

Operons that code for anabolic enzyme systems are typically regulated by inducers.

How many promoters are in an operon?

Antisense RNA does which of the following?

CAP affects which operon(s)?

A gene with a strong promoter would be under what type of control?

Which promoter(s) activate the cII gene?

Which of the following encode polycistronic mRNA?

Enzymes involved in metabolism are most likely regulated via ?

Negative transcriptional regulation is conducted by activator proteins.

Regulation of gene expression may occur at which of the following levels?

In Jacob, Monod, and Pardee's experiment, how many functional copies of lacI were there in the merozygote?

What is the gene responsible for attenuation in the trp operon?

What would be the result if the U-rich sequence after the fourth stem loop in the trp operon was replaced by a UG-rich sequence?

Operons that code for catabolic enzyme systems are typically regulated by repressors.

Which of the following is not an example of translational regulation in prokaryotes?

Translational regulatory proteins recognize specific areas of what molecule?

DNA that contains instructions for two or more structural genes produces monocistronic mRNA. FALSE

Constitutive genes are those that have constant levels of expression.

In the lac operon, the operator is an example of a trans-effect genetic regulation.

A temperate phage would be associated with which of the following viral life cycles?

Overview of Genetics

Mendelian Inheritance

Reproduction and Chromosome Transmission

Extensions of Mendelian Inheritance

Non-Mendelian Inheritance

Genetic Linkage and Mapping in Eukaryotes

Genetic Transfer and Mapping in Bacteria and

Variation in Chromosome Structure and Number

Molecular Structure of Dna and Rna

Chromosome Organization and Molecular Structure

Dna Replication

Gene Transcription and Rna Modification

Translation of Mrna

Gene Regulation in Eukaryotes

Gene Mutation and Dna Repair

Recombination and Transposition at the Molecular

Recombinant Dna Technology

Biotechnology

Genomics I: Analysis of Dna

Genomics II: Functional Genomics, Proteomics, and

Medical Genetics and Cancer

Developmental Genetics

Population Genetics

Quantitative Genetics

Evolutionary Genetics

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