What causes RNA polymerase to stall so that the rho protein bumps into it and knocks it off the DNA?

A) a region rich in A-T nucleotidesB) hairpin loop of G and C nucleotidesC) a series of GC nucleotidesD) TATA box

Answer:C

Explanation:

During termination of transcription a section of DNA contains about 20 basepair GC nucleotides. This GC rich sequence that marks the end of a gene during transcription.

In the Rho-independent transcription termination mechanisms, the formation hairpin rich in GC nucleotides causes RNA polymerase to stall,

It is difficult for RNA polymerase can to work pass through GC rich hairpin, because GC basepair is made of 3 hydrogen bonds.

This causes the RNA polymerase to stall