Question 1

Histones are________ , so they combine strongly and relatively nonspecifically with________ DNA.

Accepted Answer

A)  positively charged / negatively charged 
B)  negatively charged / positively charged 
C)  positively charged / neutral 
D)  neutral / negatively charged 
A)  positively charged / negatively charged 
B)  negatively charged / positively charged 
C)  positively charged / neutral 
D)  neutral / negatively charged

Question 2

The genes in Pseudomonas aeruginosa that enable cells to transition from growth in suspension to growth in a biofilm are expressed due to________ .

Accepted Answer

The answer of The genes in Pseudomonas aeruginosa that enable...

Question 3

A cluster of several genes whose expression is under the control of a single operator is called a(n) _________ .

Accepted Answer

The answer of A cluster of several genes whose expression...

Question 4

Regulation of the amount of enzyme synthesized occurs only at the gene level.

Accepted Answer

A) True 
 B)False

Question 5

Bacteria are the only microorganisms capable of regulating expression of their genes.

Accepted Answer

A) True 
 B)False

Question 6

What is the difference between an operator and a promoter?

Accepted Answer

A promoter sequence is found upstream of

Question 7

In the tryptophan operon, synthesis of the leader peptide results in

Accepted Answer

A)  termination of transcription of the remainder of the trp operon. 
B)  augmentation of transcription of the tryptophan structural genes. 
C)  initiation of transcription of the tryptophan structural genes. 
D)  none of the above. 
A)  termination of transcription of the remainder of the trp operon. 
B)  augmentation of transcription of the tryptophan structural genes. 
C)  initiation of transcription of the tryptophan structural genes. 
D)  none of the above.

Question 8

DNA- binding proteins typically affect translation of a protein.

Accepted Answer

A) True 
 B)False

Question 9

The phenomenon in which bacterial regulatory pathways are controlled by the density of cells of their own kind is called________ .

Accepted Answer

The answer of The phenomenon in which bacterial regulatory pathways...

Question 10

Transcriptional regulation is considered negative when an inducer binds to and deactivates a repressor.

Accepted Answer

A) True 
 B)False

Question 11

Regulation of an enzyme's activity occurs

Accepted Answer

A)  translationally. 
B)  at any point on the enzymatic production pathway. 
C)  posttranslationally. 
D)  transcriptionally. 
A)  translationally. 
B)  at any point on the enzymatic production pathway. 
C)  posttranslationally. 
D)  transcriptionally.

Question 12

Using the tryptophan operon as a model, explain a transcription pause site and the formation of a stem- loop.

Accepted Answer

A pause in mRNA transcription occurs whe

Question 13

Endospore formation in Bacillus subtilis is triggered by adverse external conditions that are monitored by a five sensor kinase system whose mechanism resembles that of

Accepted Answer

A)  a stringent response. 
B)  chemotaxis regulation. 
C)  a heat shock response. 
D)  a two- component regulatory system. 
A)  a stringent response. 
B)  chemotaxis regulation. 
C)  a heat shock response. 
D)  a two- component regulatory system.

Question 14

The promoters of positively controlled operons require activator proteins, because

Accepted Answer

A)  the promoters have nucleotide sequences that bind RNA polymerase weakly, which are not close matches to the consensus sequence. 
B)  they are needed to bind to the allosteric site of RNA polymerase. 
C)  RNA polymerase easily recognizes the consensus sequence. 
D)  they are required to inactivate the repressor proteins. 
A)  the promoters have nucleotide sequences that bind RNA polymerase weakly, which are not close matches to the consensus sequence. 
B)  they are needed to bind to the allosteric site of RNA polymerase. 
C)  RNA polymerase easily recognizes the consensus sequence. 
D)  they are required to inactivate the repressor proteins.

Question 15

Inverted repeats in DNA are frequently found in the locations where________ .

Accepted Answer

regulatory

Question 16

Most riboswitches function to control________ of mRNA, rather than its________ .

Accepted Answer

translatio

Question 17

Noncoding RNA molecules consist of _________ _,________ , and ________.

Accepted Answer

rRNA / tRNA / small

Question 18

Regulatory proteins

Accepted Answer

A)  bind to specific DNA sites. 
B)  regulate transcription. 
C)  are influenced by small molecules. 
D)  do all of the above. 
A)  bind to specific DNA sites. 
B)  regulate transcription. 
C)  are influenced by small molecules. 
D)  do all of the above.

Question 19

DNA binding proteins are typically ________and contain a region called a(n) ________that interacts specifically with a region of the DNA.

Accepted Answer

The answer of DNA binding proteins are typically ________and contain...

Question 20

The syntheses of a variety of unrelated enzymes are inhibited when cells are grown in an environment that contains glucose. This phenomenon is known as ________and is sometimes referred to as the________ .

Accepted Answer

catabolic

Exam 8: Regulation of Gene Expression

Histones are________ , so they combine strongly and relatively nonspecifically with________ DNA.

The genes in Pseudomonas aeruginosa that enable cells to transition from growth in suspension to growth in a biofilm are expressed due to________ .

A cluster of several genes whose expression is under the control of a single operator is called a(n) _________ .

Regulation of the amount of enzyme synthesized occurs only at the gene level.

Bacteria are the only microorganisms capable of regulating expression of their genes.

What is the difference between an operator and a promoter?

In the tryptophan operon, synthesis of the leader peptide results in

DNA- binding proteins typically affect translation of a protein.

The phenomenon in which bacterial regulatory pathways are controlled by the density of cells of their own kind is called________ .

Transcriptional regulation is considered negative when an inducer binds to and deactivates a repressor.

Regulation of an enzyme's activity occurs

Using the tryptophan operon as a model, explain a transcription pause site and the formation of a stem- loop.

Endospore formation in Bacillus subtilis is triggered by adverse external conditions that are monitored by a five sensor kinase system whose mechanism resembles that of

The promoters of positively controlled operons require activator proteins, because

Inverted repeats in DNA are frequently found in the locations where________ .

Most riboswitches function to control________ of mRNA, rather than its________ .

Noncoding RNA molecules consist of _________ _,________ , and ________.

Regulatory proteins

DNA binding proteins are typically ________and contain a region called a(n) ________that interacts specifically with a region of the DNA.

The syntheses of a variety of unrelated enzymes are inhibited when cells are grown in an environment that contains glucose. This phenomenon is known as ________and is sometimes referred to as the________ .

Microorganisms and Microbiology

A Brief Journey to the Microbial World

Cell Structure and Function in Bacteria and Archaea

Nutrition, Culture, and Metabolism of Microorganisms

Microbial Growth

Molecular Biology of Bacteria

Archael and Eukaryotic Molecular Biology

Viruses and Virology

Genetics of Bacteria and Arachaea

Genetic Engineering

Microbial Genomics

Phototrophy, Chemolithotrophy, and Major Biosyntheses

Catabolism of Organic Compounds

Commercial Products and Biotechnology

Microbial Evolution and Systematics

Bacteria: the Proteobacteria

Other Bacteria

Archaea

Eukaryotic Cell Biology and Eukaryotic Microorganisms

Viral Diversity

Methods in Microbial Ecology

Major Microbial Habitats and Diversity

Nutrient Cycles, Biodegradation, and Bioremediation

Microbial Symbioses

Microbial Growth Control

Microbial Interactions With Humans

Immunity and Host Defense

Immune Mechanisms

Molecular Immunology

Diagnostic Microbiology and Immunology

Epidemiology

Person-To-Person Microbial Diseases

Vectorborne and Soilborne Microbial Pathogens

Wastewater Treatment, Water Purification, and Waterborne Microbial Diseases

Food Preservation and Foodborne Microbial Diseases

Filters

Histones are , so they combine strongly and relatively nonspecifically with DNA.

Most riboswitches function to control of mRNA, rather than its .

Noncoding RNA molecules consist of _________ _, , and .

DNA binding proteins are typically and contain a region called a(n) that interacts specifically with a region of the DNA.

The syntheses of a variety of unrelated enzymes are inhibited when cells are grown in an environment that contains glucose. This phenomenon is known as and is sometimes referred to as the .