The expression of β-galactosidase is controlled by a group of genes that are collectively known as lac operon. The expression of operons are normally controlled by signal molecules. Specifically, for the lac operon, its expression is induced by two control factors: the negative control and the positive control.
Under conditions of high glucose and high lactose concentration, what will happen to the levels of β-galactosidase?
A. Essentially no β-galactosidase will be produced.
B. It depends on what other sugars are present in the growth medium.
C. High levels of β-galactosidase will be produced.
D. Moderate levels of β-galactosidase will be produced.
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