Regulation of Transcription in Prokaryotes MCQs

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Regulation of Transcription in Prokaryotes MCQs | Page 4 of 11

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Q31.
If the lac operon of the genome of bacteria is always active it has a defect in which region of the operon?

a.

i

b.

o

c.

Promoter

d.

Structural gene

Discuss
Answer: (a).i
Q32.
Lac operon follows a trans-acting control mechanism.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (a).True
Q33.
According to the repressor of lac operon which of the following are false?

a.

It is the gene product of the regulatory gene

b.

It binds to the promoter region

c.

It blocks the transcription of structural genes

d.

It combines with allolactose and thus does not bind to the operon

Discuss
Answer: (b).It binds to the promoter region
Q34.
If there is an insertion mutation in the operator of the lac operon, the expression of the lac structural gene will be __________

a.

Resistant to catabolic expression

b.

Unexpressed

c.

Constitutively expressed

d.

Permanently disabled

Discuss
Answer: (c).Constitutively expressed
Q35.
The complete expression of the lac operon requires __________

a.

Lactose

b.

Allolactose

c.

Lactose and cAMP

d.

Allolactose and cAMP

Discuss
Answer: (d).Allolactose and cAMP
Q36.
What effect would a loss-of-function mutation have on the expression of the gene encoding the catabolite activator protein of the lac operon?

a.

Low expression in the presence of lactose and off in its absence, regardless of the presence or absence of glucose

b.

High expression in the presence of lactose and off in its absence, regardless of the presence or absence of glucose

c.

Low expression in the presence of glucose and off in its absence, regardless of the presence or absence of lactose

d.

High expression in the presence of glucose and off in its absence, regardless of the presence or absence of lactose

Discuss
Answer: (a).Low expression in the presence of lactose and off in its absence, regardless of the presence or absence of glucose
Q37.
Mutation in the regulatory gene of a positively controlled operon can be identified by __________

a.

Operon induction

b.

Operon repression

c.

High expression

d.

Constitutive expression

Discuss
Answer: (b).Operon repression
Q38.
In the case of lac operon, the gene expression is inhibited by __________

a.

Presence of lactose

b.

Interaction of repressor with lactose

c.

Interaction of repressor with operator

d.

Interaction of lactose with operator

Discuss
Answer: (c).Interaction of repressor with operator
Q39.
Which of the following is false about bacterial tryptophan operon?

a.

It has two kinds of regulation system

b.

The co-repressor is the catabolite activator protein

c.

When tryptophan supply is insufficient the tryptophan operon activates

d.

The complex of repressor with co-repressor on binding to the operator blocks transcription

Discuss
Answer: (b).The co-repressor is the catabolite activator protein
Q40.
Attenuator in the tryptophan operon is the __________

a.

Operator sequence

b.

Non-transcribed region within the operon

c.

Leader sequence for the site of RNA polymerase binding

d.

Leader sequence in the tryptophan mRNA coding for many tryptophan residues

Discuss
Answer: (d).Leader sequence in the tryptophan mRNA coding for many tryptophan residues
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