Lac Operon Video Lessons

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Problem: 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

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

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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