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

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

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Lactose catabolism occurs first and glucose is ignored

Glucose catabolism occurs first and lactose is ignored

Neither glucose and lactose undergo catabolism

Both glucose and lactose catabolism occur simultaneously

answer is B.

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Detailed 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 beta galactosidase, that would allow utilization of the other sugars.

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