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Exam 13: Microbial Genetics Regulation of Gene Expression

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Question 21

Multiple Choice

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While standard two-component regulatory systems typically act to control gene transcription, phosphorelay systems can act either to control gene transcription or to control

A) translation
B) protein activity
C) DNA replication
D) all of the choices

E) All of the above
F) A) and B)

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Question 22

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In eukaryotes, some small RNAs are important structural components of the

A) ribosome.
B) endoplasmic reticulum.
C) spliceosome.
D) eucaryotes do not utilize small RNAs.

E) C) and D)
F) A) and B)

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Question 23

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The regulation of gene expression in the Archaea is totally different than the regulation of gene expression in Bacteria.

__________ alter repressor proteins thereby increasing the rate of transcription initiation.

What is the key factor determining whether or not attenuation will occur when transcription of the

In eukaryotes, transcription factors that function as repressors bind regulatory sites called _____________.

In the presence of both glucose and lactose, the lactose repressor is not bound to the operator and the genes of the lactose operon are expressed.

__________ activate repressor proteins thereby decreasing the synthesis of certain enzymes.

What term describes a set of genes that is controlled by a common regulatory protein?

In eukaryotes, transcription factors that function as activators bind regulatory sites called _____________.

Small RNAs that regulate translation by binding to the leader region of mRNAs are called antisense RNAs.

Acylhomoserine lactones used in quorum sensing regulate their own synthesis by a(n) ____________ system.

If Escherichia coli is cultured in broth containing both glucose and lactose, it

Which of the following is not a regulatory mechanism used to control the lactose operon in Escherichia coli?

Gene regulation during sporulation in Bacillus subtilis involves BOTH temporal and spatial control.

______________ is used to control transcription of some anabolic pathways involved in amino acid biosynthesis.

If a particular end product is already present in abundant amounts in the environment, cells will usually not continue to produce enzymes whose sole purpose is to manufacture more of that end product.

The activity of adenyl cyclase is influenced by

An operon network that is under the control of a common regulatory protein while each operon is still also under the control of its own unique regulatory protein is most specifically referred to as a

In some circumstances, when two different carbon sources are available, growth will occur first using one carbon source, then after a short lag period, growth will resume using the second carbon source. This process is called __________ growth.