Genetic Regulation Prokaryotes

Question: Methylated gene are
[A].

active

[B].

silent

[C].

dynamic

[D].

either (a) or (b)

Answer: Option B

Explanation:

No answer description available for this question.

Question: Genes which need to be coordinately regulated but are not in operons may be regulated by
[A].

common transcription factor binding domains

[B].

TATA boxes

[C].

CAAT regions

[D].

GC regions

Answer: Option A

Explanation:

No answer description available for this question.

Question: DNA is methylated at
[A].

AC sequences

[B].

TATA sequences

[C].

CAAT sequences

[D].

CG sequences

Answer: Option D

Explanation:

No answer description available for this question.

Question: Alternate splicing of RNA transcripts is a mechanism to regulate
[A].

tubulin

[B].

tachykinins

[C].

DNA methylation

[D].

leucine zippers

Answer: Option B

Explanation:

No answer description available for this question.

Question: Enhancers differ from promoters in that
[A].

they initiate transcription

[B].

they are adjacent to the start codon

[C].

their orientation can be inverted without effect

[D].

they are restricted to a specific gene

Answer: Option C

Explanation:

No answer description available for this question.

Question: A frameshift mutation occurs in the sigma subunit gene transcribed as part of SPOl early genes. What will be the immediate result?
[A].

Early genes will not be translated

[B].

Middle genes will not be transcribed

[C].

The bacterial host will lyse immediately

[D].

Infection will proceed as usual

Answer: Option C

Explanation:

No answer description available for this question.

Question: In the presence of high levels of tryptophan
[A].

attenuator allows transcription of trp structural genes

[B].

attenuator propogates transcription

[C].

attenuator terminates transcription

[D].

none of the above

Answer: Option C

Explanation:

No answer description available for this question.

Question: A mutation in the tip binding site of the repressor would result in
[A].

constitutive trp operon expression

[B].

inducible trp operon expression

[C].

no operon expression

[D].

none of the above

Answer: Option A

Explanation:

No answer description available for this question.

Question: In the presence of tryptophan in the cell, the repressor is __________
[A].

bound to tryptophan

[B].

bound to DNA

[C].

bound to both DNA and tryptophan

[D].

bound to neither tryptophan nor DNA

Answer: Option C

Explanation:

No answer description available for this question.

Question: Which of the following occur in the presence of glucose?
[A].

lac Z gene expression is increased

[B].

cAMP increases

[C].

Binding of CAP-cAMP complex to the promoter area decreases

[D].

none of the above

Answer: Option C

Explanation:

No answer description available for this question.