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 a sigma subunit.
D. the core polymerase plus two beta subunits.
E. the core polymerase plus two alpha subunits.
Answer: C
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