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
Which of the following mutations would result in constitutive expression of the lac operon?
a. A mutation in lacI that prevents the repressor from binding lactose
b. A mutation in lacY that prevents transport of lactose into the cell
c. A mutation in lacI that increases the affinity of repressor binding to the operator
d. A mutation in lacI that prevents the repressor from binding to the operator
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