In Prokaryotes,a Holoenzyme is Formed When What is Added to the Core

Question

In prokaryotes,a holoenzyme is formed when what is added to the core enzyme?
A) Start codons
B) b
C) b'
D) σ
E) a

Accepted Answer

In prokaryotes, a holoenzyme is formed when the σ factor is added to the core enzyme. The σ factor is responsible for the recognition of the promoter sequence in DNA during transcription initiation.