Sigma (s) subunit is present in:: (A) 80 S subunit, (B) RNA polymerase, (C) Required for initiation of replication, (D) DNA polymerase
Answer is B. RNA POLYMERASE DNA dependent RNA polymerase Complex holoenzyme with five polypeptides units Five polypeptides - 2 alpha , 1b , 1b' , one sigma Sigma subunit enables the core enzyme to recognize and bind the promoter region to form the preinitiation complex (PIC). b-Main catalytic activity b' binds to DNA template