McGraw-Hill Online Learning Center Test<BLURT>

McGraw-Hill Online Learning Center Test


1. Review the animation and answer the following questions.

A system in which the enzymes are produced only when needed is termed

A. repressible.
B. inducible.
C. constitutive.
D. variable.


2. The lac operon in E. coli consists of A. three genes.
B. three genes and three promoters.
C. three genes and an operator.
D. three genes, promoter and operator sites.


3. When lactose is absent, the repressor is A. inactive and will bind to the operator.
B. inactive and will not bind to the operator.
C. active and will bind to the operator.
D. active and will not bind to the operator.
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