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
What is the function of the lacZ gene?
a) This gene encodes an enzyme, galactoside permease, which transports lactose into the cell.
b) This gene encodes an enzyme, β-galactosidase, that cleaves lactose into two glucose molecules.
c) This gene encodes the repressor of the lac operon.
d) This gene encodes an enzyme, β-galactosidase, which cleaves lactose into glucose and galactose.
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