Transcription and Regulation

Question: The binding of lac repressor to DNA could be considered to be analogous to
[A].

competitive inhibition of an enzyme

[B].

mixed-type inhibition of an enzyme

[C].

uncompetitive inhibition of an enzyme

[D].

allosteric effects in enzyme regulation

Answer: Option A

Explanation:

No answer description available for this question.

Question: In prokaryotes, transcription is
[A].

terminated by the stop codon

[B].

terminated by a protein called rho

[C].

terminated by a poly A sequence

[D].

terminated by a start codon

Answer: Option B

Explanation:

No answer description available for this question.

Question: Enhancers are regions that
[A].

bind RNA polymerase

[B].

are adjacent to the TATA box

[C].

are CAT box binding proteins

[D].

modulate transcription

Answer: Option D

Explanation:

No answer description available for this question.

Question: In eukaryotes, there are three different RNA polymerases. The RNA polymerase responsible for transcription of mRNA is
[A].

RNA polymerase I

[B].

RNA polymerase II

[C].

RNA polymerase III

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: In both eukaryotes and prokaryotes, a promoter region that is rich in AT bases is called as
[A].

CATT

[B].

Shine Dalgarno region

[C].

TATA box

[D].

SV40 region

Answer: Option C

Explanation:

No answer description available for this question.

Question: Each tRNA molecule has a cloverleaf secondary structure consisting of
[A].

three stem loops

[B].

two stem loops

[C].

four stem loops

[D].

either (a) or (b)

Answer: Option A

Explanation:

No answer description available for this question.

Question: Multiple copies of 5S genes, located at a chromosomal site distinct from the other rRNA genes
[A].

are transcribed by rRNA polymerase III and the 5S rRNA

[B].

are transcribed by rRNA polymerase II

[C].

are transcribed by rRNA polymerase I and the 5S rRNA

[D].

are transcribed by DNA polymerase I

Answer: Option A

Explanation:

No answer description available for this question.

Question: Most transcripts of protein coding genes are cleaved
[A].

at the 3′ end just after a poly adenylation signal

[B].

at the 3′ end just before a poly adenylation signal

[C].

at the 5′ end immediately after a poly adenylation signal

[D].

at the 5′ end immediately before a poly adenylation signal

Answer: Option A

Explanation:

No answer description available for this question.