Problem: Under which conditions are the lac structural genes expressed most efficiently? a) High glucose, no lactose b) No glucose, no lactose c) High glucose, high lactose d) No glucose, high lactose

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lac operon: synthesizes proteins for the metabolism of lactose (lac genes)

• when lactose and glucose are present, lac genes are not expressed

• when only lactose is present, lac genes are expressed


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Problem Details

Under which conditions are the lac structural genes expressed most efficiently? 

a) High glucose, no lactose 

b) No glucose, no lactose 

c) High glucose, high lactose 

d) No glucose, high lactose