試題詳解

25.E. coli does not express ẞ-galactosidase when its growth medium containing both lactose and glucose, because
(A) CAP is not activated for DNA binding to promote transcription initiation.
(B) Glucose activates the expression of lac repressor.
(C) Lac repressor can still bind to the lac operator sequence.
(D) Glucose interferes with lactose binding with the lac repressor.
(E) Glucose inhibits lac operon