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The lac operon is under positive control, a phenomenon called _________________

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The lac operon is under positive control, a phenomenon called _________________

(a) regulation

(b) mutation

(c) lactose-effect

(d) glucose-effect

The question was asked in class test.

The above asked question is from Gene Expression Control topic in section Control of Gene Expression of Cell Biology

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Right choice is (d) glucose-effect

The best I can explain: The lac operon is negatively regulated by repressor proteins. There is also a positive control that prevails in the lac operon, called the glucose-effect. When glucose is present in the medium along with other substrates, the catabolism of the letter is suppressed.

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