First slide

Regulation of Gene Expression

Question

Lactose is a substrate for

Easy

A

galactosidase
B

$α$ -galactosidase
C

$β$ -galactosidase
D

$γ$ -galactosidase

Solution

Lactose is the substrate for the enzyme beta ( $β$ ) galactosidase and it regulates the switching on and off of the lac operon. Hence, it is termed as inducer.

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