First slide

Regulation of Gene Expression

Question

If in the medium both glucose and lactose are present in same concentration, then:

Easy

A

Lactose catabolism occurs first and glucose is ignored
B

Glucose catabolism occurs first and lactose is ignored
C

Neither glucose and lactose undergo catabolism
D

Both glucose and lactose catabolism occur simultaneously

Solution

If bacterial cells are supplied with glucose as well as a variety of other substrates, such as lactose or galactose, the cells catabolize the glucose first and ignore the other sugars. The glucose in the medium acts to repress the production of various catabolic enzymes, such as Î² âgalactosidase, that would allow utilization of the other sugars.

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