Question

Arrange the events taking place during transcription in order:

i) The pre-RNA undergoes processing
ii) RNA polymerase moves downstream unwinding the DNA
iii) RNA polymerase binds to the promoter
iv) RNA transcript is released and polymerase detaches from the DNA
v) Polymerase initiates RNA synthesis at the start point on the template strand

A. iv, i, ii, iii
B. ii, i, iv, iii
C. i, ii, iv, iii
D. iv, i, iii, ii

Answer 1

The correct order of transcription events is initiation (ii), elongation (i), termination (iv), followed by the reformation of the transcription complex or any additional steps represented by (iii). The detailed process includes the crucial roles of promoters and RNA polymerase in the initiation, elongation, and termination phases of transcription.

Step-by-step explanation:

The question is asking to arrange the events of transcription in the correct order. Transcription is the process through which a segment of DNA is copied into RNA by the enzyme RNA polymerase. The correct order of events during transcription is initiation, elongation, and termination. Therefore, if we align these stages with the provided options, the correct sequence would be initiation first (ii), elongation next (i), with termination following (iv), and whatever the third item (iii) represents would come last, assuming it is part of the transcription process or the reformation of the transcription complex.

Detailed steps of transcription involve the following: The promoter serves as the binding site for RNA polymerase and transcription factors, which are crucial for the initiation phase. During initiation, the DNA strands unwind, and RNA polymerase binds to the promoter region. Then, RNA polymerase moves along the DNA during elongation, synthesizing a complementary RNA strand. Termination occurs when the RNA polymerase reaches a stop signal and releases the newly formed RNA.