Question 1

The term enzyme adaptation is used to describe an enzyme that appears in a living cell following exposure to a specific substrate.

Accepted Answer

A) True 
 B)False

Question 2

Constitutive genes are those that have constant levels of expression.

Accepted Answer

A) True 
 B)False

Question 3

The form of regulation that involves a physical change in the shape of an enzyme is called allosteric regulation.

Accepted Answer

A) True 
 B)False

Question 4

In a particular

Accepted Answer

A) two 
B) zero 
C) three 
D) one 
E) coli strain, a mutation in the thiMD operon results in improper formation of the stem loop secondary structure making it impossible to bind TPP.There are two enzymes encoded by the thiMD operon.How many of the enzymes encoded in the thiMD operon are translated? 
A) two 
B) zero 
C) three 
D) one 
E) coli strain, a mutation in the thiMD operon results in improper formation of the stem loop secondary structure making it impossible to bind TPP.There are two enzymes encoded by the thiMD operon.How many of the enzymes encoded in the thiMD operon are translated?

Question 5

A gene is inducible and under negative control. Which of the following pairs will allow expression of this gene?

Accepted Answer

A) Activator + repressor 
B) Activator + inhibitor 
C) Repressor + inducer 
D) Repressor + co-repressor 
A) Activator + repressor 
B) Activator + inhibitor 
C) Repressor + inducer 
D) Repressor + co-repressor

Question 6

Which of the following is an example of post 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 7

Translational regulatory proteins recognize specific areas of what molecule?

Accepted Answer

A) tRNA 
B) ribosome 
C) rRNA 
D) mRNA 
A) tRNA 
B) ribosome 
C) rRNA 
D) mRNA

Question 8

Allosteric regulation is accomplished by

Accepted Answer

A)  a small molecule that fits into an enzyme's active site. 
B)  a large protein that blocks an enzyme's active site. 
C)  a small molecule that fits into a site on the enzyme that is not the active site. 
D)  a small molecule that covalently modifies a site on the enzyme that is not the active site. 
A)  a small molecule that fits into an enzyme's active site. 
B)  a large protein that blocks an enzyme's active site. 
C)  a small molecule that fits into a site on the enzyme that is not the active site. 
D)  a small molecule that covalently modifies a site on the enzyme that is not the active site.

Question 9

An activator is present and results in the increase in transcription of the target gene. This is an example of _______________.

Accepted Answer

A) termination 
B) positive control 
C) negative control 
D) feedback inhibition 
A) termination 
B) positive control 
C) negative control 
D) feedback inhibition

Question 10

If a bacteria is placed in an environment that contains both glucose and lactose, the regulation of the lac operon will allow which nutrient to be processed first?

Accepted Answer

A) Glucose 
B) Lactose 
C) Both will be processed equally 
D) Neither will be processed in this environment 
A) Glucose 
B) Lactose 
C) Both will be processed equally 
D) Neither will be processed in this environment

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

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

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 
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

Question 14

Negative transcriptional regulation is conducted by activator proteins.

Accepted Answer

A) True 
 B)False

Question 15

The regulation of the CAP complex using cAMP is an example of inducible genetic regulation.

Accepted Answer

A) True 
 B)False

Exam 14: Gene Regulation in Bacteria

The term enzyme adaptation is used to describe an enzyme that appears in a living cell following exposure to a specific substrate.

Constitutive genes are those that have constant levels of expression.

The form of regulation that involves a physical change in the shape of an enzyme is called allosteric regulation.

In a particular

A gene is inducible and under negative control. Which of the following pairs will allow expression of this gene?

Which of the following is an example of post translational regulation in prokaryotes?

Translational regulatory proteins recognize specific areas of what molecule?

Allosteric regulation is accomplished by

An activator is present and results in the increase in transcription of the target gene. This is an example of _______________.

If a bacteria is placed in an environment that contains both glucose and lactose, the regulation of the lac operon will allow which nutrient to be processed first?

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

Antisense RNA does which of the following?

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?

Negative transcriptional regulation is conducted by activator proteins.

The regulation of the CAP complex using cAMP is an example of inducible genetic regulation.

Overview of Genetics

Mendelian Inheritance

Chromosome Transmission During Cell Division and Sexual Reproduction

Extensions of Mendelian Inheritance

Non-Mendelian Inheritance

Genetic Linkage and Mapping in Eukaryotes

Genetic Transfer and Mapping in Bacteria and Bacteriophages

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 I: Transcriptional Regulation

Gene Regulation in Eukaryotes II: Epigenetics and Regulation at the RNA Level

Genetics of Viruses

Gene Mutation and Dna Repair

Recombination and Transposition at the Molecular Level

DNA Technologies

Biotechnology

Genomics I: Analysis of DNA

Genomics II: Functional Genomics, Proteomics, and Bioinformatics

Medical Genetics and Cancer

Developmental Genetics

Population Genetics

Quantitative Genetics

Evolutionary Genetics

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