試題詳解

37. When bacteria are grown in the presence of lactose,
(A)CAMP-CRF protein binds upstream of the promoter and increases transcription through recruitment of RNA polymerase.
(B)CAMP-CRF protein is bound to lactose and is active and activates transcription through physical interference with the repressor.
(C)the lac repressor is bound to allolactose, is now inactive and unable to bind the operon; thereby allowing RNA polymerase access to initiate transcription.
(D) the lac repressor is bound to allolactose, is now inactive and unable to bind the operon; thereby allowing CAP protein access to the promoter and increasing the rate of transcription.