When E. coli are grown in a medium with low levels of lactose,
A) all the enzymes of the lactose operon are present in very small quantities.
B) all the enzymes of the lactose operon are present in large quantities.
C) no enzymes of the lactose operon are present.
D) $\beta$-galactosidase and permease are present in small quantities, but transacetylase is present in large quantities.
E) the mRNA of the lactose operon is not present at all.

Question

Quizplus · Accepted Answer

In low lactose conditions, the lactose operon is minimally expressed, resulting in small quantities of its enzymes.

When E Coli Are Grown in a Medium with Low Levels