Which of the following statements about the lactose operon
in E. coli is TRUE?
Group of answer choices
It contains the genes that encode the proteins for lactose
metabolism.
Its transcription is blocked when allolactose binds to the lac
repressor.
It contains a promoter, an operator and an attenuator.
It is barely transcribed, when lactose is present in the medium
and glucose is absent.
It is transcribed at very high levels, when lactose is absent,
and glucose is present.