Lac Operon Video Lessons

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Problem: What happens to the expression of the lacI gene if lactose is not available in the cell? a) The lacI gene turns off. b) The lacI gene increases its rate of transcription. c) The lacI gene turns on. d) There is no change—the lacI gene is constitutively expressed.

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 happens to the expression of the lacI gene if lactose is not available in the cell? 

a) The lacI gene turns off. 

b) The lacI gene increases its rate of transcription. 

c) The lacI gene turns on. 

d) There is no change—the lacI gene is constitutively expressed.

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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.