Q. A culture of E. coli is grown in a medium containing glucose and lactose. The expression of lactose operon over time in cells is shown in graph below. Which statement best describes the change that occur at point A.?

A) Lactose was added to the culture
B) cAMP concentration increased in the cell
C) Glucose was added to the culture
D) Repressor protein dissociated from the operator

14022199_755545011215063_318756181342207733_n

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