How many of the gene products of the lactose operon are required for the utilization of lactose to occur?
A) none
B) one
C) two
D) three
E) four

Question

Quizplus · Accepted Answer

Two gene products are required for the utilization of lactose: beta-galactosidase and lactose permease. The third gene product, the lactose repressor, regulates the operon by binding to the operator when lactose is absent. The fourth gene product, CRP (cyclic AMP receptor protein), enhances transcription of the operon by binding with cAMP to the promoter region when glucose is low.

How Many of the Gene Products of the Lactose Operon