The Enzyme $\beta$ -Galactosidase Acts on Lactose to Form Galactose

question 6

Multiple Choice

The enzyme $\beta$ -galactosidase acts on lactose to form galactose.In turn,the presence of galactose leads to expression of the enzymes responsible for the metabolism of galactose.In this case,lactose is serving as a carbon source and as a(n)

• A)inducer.
• B)repressor.
• C)effector.
• D)operon.

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