The concept of the operon was proposed based on the ability of E. coli to metabolize the disaccharide ________ only when present in large excess over glucose.
A)sucrose
B)cellobiose
C)galactose
D)lactose
E)maltose

Question

Quizplus · Accepted Answer

E. coli can metabolize lactose only when it is present in large excess over glucose. The discovery led to the proposal of the operon concept, which involves the coordinated control of gene expression in bacterial cells. The lactose operon is a classic example of an inducible operon in which the presence of lactose induces the expression of the genes involved in lactose metabolism.

The Concept of the Operon Was Proposed Based on the Ability