Which of the Following Statements About the Lac and Trp

Multiple Choice

Which of the following statements about the lac and trp operons in E. coli are true? Please select all that apply.

A) The lac operon is turned on in the presence of lactose.
B) The trp operon is turned on in the presence of tryptophan
C) The lac repressor and the trp repressor both bind to the operator for their respective operons.
D) Tryptophan is used as a carbon source in the presence of glucose
E) Lactose is used as a carbon source in the presence of glucose.