Regulation of Transcription in Prokaryotes MCQs

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Regulation of Transcription in Prokaryotes MCQs | Page 2 of 11

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Q11.
In case of transcription which is the rate limiting step?

a.

Binding of RNA polymerase

b.

Unwinding of DNA duplex

c.

Promoter escape

d.

Formation of the open complex

Discuss
Answer: (a).Binding of RNA polymerase
Q12.
The site where repressor binds the DNA is the ______________

a.

Promoter

b.

Terminator

c.

Operator

d.

ORF

Discuss
Answer: (c).Operator
Q13.
Recruitment of RNA polymerase to the promoter is a ___________

a.

Covalent binding

b.

Cooperative binding

c.

Protein-protein interaction

d.

Van der Waals forces

Discuss
Answer: (b).Cooperative binding
Q14.
The proteins of which of the following genes are regularly needed for cellular activity?

a.

Regular genes

b.

Smart genes

c.

Structural genes

d.

Housekeeping genes

Discuss
Answer: (d).Housekeeping genes
Q15.
Which of the following are the products of the constitutive gene?

i. Involved in the synthesis of structural elements of the cell
ii. Involved in catabolic pathway
iii. Involved in anabolic pathway
iv. Synthesized continuously

a.

i and ii

b.

ii and iii

c.

iii and iv

d.

i, ii, iii and iv

Discuss
Answer: (d).i, ii, iii and iv
Q16.
Which of the following is not an example of allosteric regulation?

a.

Inactivation of nitrogenase by ADP ribosylation

b.

Catabolite repression by CAP in E. coli

c.

Regulation of phosphofructokinase activity

d.

Regulation of lac operon by allolactose

Discuss
Answer: (a).Inactivation of nitrogenase by ADP ribosylation
Q17.
Operons are ___________

a.

of approximately uniform size

b.

found in some eukaryotes

c.

not able to bind to proteins

d.

smaller in lower eukaryotes and longer in higher eukaryotes

Discuss
Answer: (b).found in some eukaryotes
Q18.
Which of the following are correct according to operons?

i) Consists of multiple genes organized between a promoter and a terminator
ii) Member genes regulate with coordination
iii) Usually controlled by autogenous transcription
iv) Contains genes for stress tolerance exclusively

a.

i and ii

b.

ii and iii

c.

iii and iv

d.

i, ii, iii and iv

Discuss
Answer: (a).i and ii
Q19.
Choose the correct pair among the following.

a.

The DNA sequence to which stigma factor binds โ€“ enhancer

b.

The DNA sequence to which RNA polymerase binds โ€“ operator

c.

The DNA sequence that codes for a protein โ€“ structural gene

d.

The DNA sequence to which repressors binds โ€“ promoter

Discuss
Answer: (c).The DNA sequence that codes for a protein โ€“ structural gene
Q20.
Which of the following is not present in the ฮฒ-galactosidase structural gene and thus is not transcribed by the same promoter?

a.

Lac A

b.

Lac I

c.

Lac Z

d.

Lac Y

Discuss
Answer: (b).Lac I
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