Deck 17: Regulation of Transcription in Eukaryotes

Question 1

Xist is .

A)a gene encoding an untranslated RNA involved in X-inactivation
B)the heterochromatin of inactivated X chromosomes
C)is a gene that is only found on active X chromosomes
D)helps inactivate the X chromosome of males

Answer 1

A

Question 2

Which of the following is commonly used as a control point in eukaryotic transcription?

A)initiation
B)elongation
C)termination
D)RNA processing

Answer 2

A

Question 3

Simple repressors are common in eukaryotes.

Answer 3

False

Question 4

In eukaryotes,negative regulation occurs by .

A)obstructing RNA polymerase II
B)interfering with activators
C)interfering with repressors
D)binding of repressors to operators

Question 5

X-inactivation .

A)only occurs in males
B)is the deactivation of both X chromosomes in all females
C)shuts down one of the two X chromosomes in females
D)occurs by the action of histone acetylation

Question 6

Euchromatin .

A)is only found in prokaryotes
B)does not allow gene expression to occur
C)is densely packed chromatin
D)is loosely packed chromatin

Question 7

Specific transcription factors .

A)modulate gene expression in response to a specific stimulus
B)are not able to enter the nucleus of eukaryotes and instead help regulate gene expression at the post-transcriptional level
C)bind to target mRNAs prior to translation
D)prevent RNA polymerase II from binding to the DNA

Question 8

Housekeeping genes are always .

A)off until needed
B)on
C)induced
D)repressed

Question 9

Acetylated histones .

A)form highly condensed heterochromatin
B)are a target of proteases
C)never occurs
D)allow nucleosomes to be less aggregated

Question 10

DNA sequences in eukaryotes that are rich in guanine and cytosine are called and are usually targets of .

A)inteins;acetylation
B)GC islands;methylation
C)promoters;transcriptional regulation
D)enhancers;mediator binding