By Team Aakash Byju's | 25th November 2022

RNA Polymerase Transcription

Choose the correct answer from the alternatives given: Which of the following steps in transcription is catalysed by RNA polymerase?

A.                 Initiation

B.                 Elongation

C.                Termination

D.               All of the above

Detailed Explanation

The correct option is  D. All of the above.

Arrow

In bacteria, all kinds of RNA transcription are catalysed by a single DNA-dependent RNA polymerase.

RNA polymerase binds to the promoter and initiates transcription (Initiation).

DNA

mRNA

5'

It uses nucleoside triphosphates as its substrate and polymerises in a template-dependent fashion following the rule of complementarity.

Once the polymerases reach the terminator region, the nascent RNA falls off. This results in the termination of transcription.

tRNA

Small Ribosomal Subunit

Large Ribosomal  Subunit

5'

3'