The lac operon is under positive control, a phenomenon called _________________(a) regulation(b) mutation(c) lactose-effect(d) glucose-effectThe 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

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

1.	The lac operon is under positive control, a phenomenon called _________________(a) regulation(b) mutation(c) lactose-effect(d) glucose-effectThe 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
Answer» 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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