試題詳解

46. The sigma factor of E. coli RNA polymerase:
(A) associates with the promoter before binding core enzyme.
(B) combines with the core enzyme to confer specific binding to a promoter.
(C) is inseparable from the core enzyme.
(D) is required for termination of an RNA chain.
(E) will catalyze synthesis of RNA from both DNA template strands in the absence of the core enzyme.