In prokaryotes, the RNA polymerase holoenzyme consists of
A. the core polymerase plus two alpha subunits, two beta subunits, and a sigma subunit.
B. two alpha subunits, two beta subunits, and two sigma subunits.
C. the core polymerase plus two beta subunits.
D. the core polymerase plus two alpha subunits.
E. the core polymerase plus a sigma subunit.
Answer: E
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