Lac Operon Video Lessons

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Problem: What would be the effect of a mutation in the lacI gene that prevented the repressor from binding to lactose?A. The lac Z, Y, and A genes would not be expressed.B. The lac Z, Y, and A genes would be expressed constitutivelyC. The lac Z, Y, and A genes would be repressed by lactose.D. The lac Z, Y, and A genes would be induced by lactose.E. The lac Z and Y genes would be repressed but not the lac A gene.

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 would be the effect of a mutation in the lacI gene that prevented the repressor from binding to lactose?

A. The lac Z, Y, and A genes would not be expressed.

B. The lac Z, Y, and A genes would be expressed constitutively

C. The lac Z, Y, and A genes would be repressed by lactose.

D. The lac Z, Y, and A genes would be induced by lactose.

E. The lac Z and Y genes would be repressed but not the lac A gene.

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Lac Operon concept. You can view video lessons to learn Lac Operon. Or if you need more Lac Operon practice, you can also practice Lac Operon practice problems.