Explore topic-wise MCQs in Molecular Biology.

This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Molecular Biology knowledge and support exam preparation. Choose a topic below to get started.

1.

AFTER_THE_BINDING_OF_POLYMERASE_TO_THE_DNA_TEMPLATE_THE_‚ÂÀ√¨‚ÀÖ√¢_FACTOR_IS_EJECTED.?$#
A. True
B. False
Answer» C.
Discussion
2.

THE_TERNARY_COMPLEX_IS_FORMED_BY_THE_POLYMERASE,_DNA_DUPLEX_AND_THE_NASCENT_RNA.?$

A. True
B. False
Answer» C.
Discussion
3.

RNA polymerase adds the nucleotides de novo. The first nucleotide added by the polymerase is ___________?

A. ATP
B. TTP
C. GTP
D. CTP
Answer» B. TTP
Discussion
4.

Region 1.1 of the σ factor mimics the DNA and is negatively charged.$

A. True
B. False
Answer» B. False
Discussion
5.

The channel that allows the exit of the coding strand is known as ____________

A. NTP channel
B. NT channel
C. T channel
D. Downstream DNA channel
Answer» C. T channel
Discussion
6.

How many channels are found in the RNA polymerase clamp?

A. 3
B. 4
C. 5
D. 6
Answer» D. 6
Discussion
7.

With respect to the formation of complex between polymerase and DNA template which of the following is correct?

A. Open: reversible; Closed: irreversible
B. Open: irreversible; Closed: reversible
C. Open and closed: reversible
D. Open and closed: irreversible
Answer» C. Open and closed: reversible
Discussion
8.

The isomerisation of σ70 of bacterial polymerase is an energy dependent process.$

A. True
B. False
Answer» C.
Discussion
9.

To facilitate binding of σ70 the melting of the template and non – template strands occurs between the positions ____________$

A. -11 to +3
B. -9 to +5
C. -10 to +1
D. -10 to +2
Answer» B. -9 to +5
Discussion
10.

Without using primers for RNA synthesis the polymerase produces small stretches of RNA of _____________ nucleotides.

A. 8
B. 10
C. 12
D. 14
Answer» C. 12
Discussion