39. In prokaryotes, transcription is controlled in four principal ways. Which of the following can control the production of β-galactosidase in
(E) coli?
(A) Alternative  factors
(B) Enhancers
(C) Operons
(D) Transcription attenuation

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統計： A(1), B(0), C(5), D(0), E(0) #2769037