10 Jun Adding or removing the 5′ cap on messenger RNA
Question
Adding or removing the 5′ cap on messenger RNA helps regulate gene activity at the level of translation because:
Select one:
a. the 5? cap is necessary for 3? polyadenylation.
b. the 5? cap is necessary for RNA splicing.
c. the 5? cap is necessary for translational initiation.
d. the 5? cap is necessary for translational termination.
In the lactose operon of E. coli, the operator is:
Select one:
a. a regulatory region to which RNA polymerase binds
b. a regulatory region to which the repressor binds
c. a regulatory region to which CRP binds
d. a repressor protein
In the lactose operon of E. coli, the lacP- mutation:
Select one:
a. produces the structural genes all the time.
b. produces the structural genes only in the presence of the inducer.
c. never produces the structural genes.
d. produces the structural genes only in the absence of the inducer.
In the lactose operon of E. coli, which of the following genotypes transcribes the lacZ and lacY genes constitutively?
Select one:
a. I+ P- O+ Z+ Y+
b. I+ P+ O+ Z- Y+
c. I- P+ O+ Z+ Y+
d. I+ P+ O+ Z+ Y-
In a messenger RNA, adding or removing the 3? poly-A tail:
Select one:
a.
alters messenger RNA stability.
b.
is necessary for RNA splicing.
c.
changes the rate of translation.
d.
changes the rate of translational initiation.
In the lactose operon of E. coli, the product of the lacI gene is:
Select one:
a. a negative regulator of transcription.
b. a positive regulator of transcription.
c. an enhancer of transcription.
d. a silencer of transcription.
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