Lac Operon Video Lessons

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Problem: 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.

FREE Expert Solution

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

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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