In the lac operon, what are the likely effects on operon...

Question

In the lac operon, what are the likely effects on operon gene transcription of the mutations described in a–e?

Mutation of consensus sequence in the lac promoter

Accepted Answer

Hi, everyone. Welcome back. Let's look at our next question. Lac Operon is an operon that is involved in the regulation of lactose metabolism in several enteric bacteria, including Escherichia coli. What happens if a mutation occurs in the lack a gene of the structural genes? Choice? A permeate will not be synthesized. Choice B beta Galata will not be synthesized. Choice C trans acetylase will not be synthesized or choice D none of these. So let's recall that the lac operon controls the transcription of three different structural genes and they are called lack Z lack Y and lack A. And our question asks us what will happen if a mutation occurs in the lack a gene while the lack a gene codes for the protein trans acela. So we can predict that if there's a mutation in that lack a gene, that choice C trans ace ace will not be synthesized. So let's just look briefly to be thorough at our other answer. Choices. Obviously, we can eliminate choice D none of these. Since we have a correct answer choice A says permeate will not be synthesized. Permeate is quoted for by the lack Y gene. So different gene not affected by a mutation in the lack a gene uh permeate. You can think of the word permeable is a transmembrane pump protein that allows the cell to import lactose. But not the answer we're looking for. The choice. B says beta galacto CYA will not be synthesized. Well, that is coded for by the lac Z gene. So also not a correct answer. And we can recall beta galacto ace is that gene that cleaves the bond between the two sugars that make up the disaccharide lactose. So we have the enzyme that is affected by the mutation, lack A is choice C trans acetylase. And interestingly enough, little side note trans doesn't really seem to be involved in lactose metabolism, but it is under the control of the lac operon. And that mutation in the LAC A gene will mean that it doesn't get synthesized. So choice C is our answer. See you in the next video.

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In the lac operon, what are the likely effects on operon gene transcription of the mutations described in a–e?

Mutation of consensus sequence in the lac promoter

My Courses

Chemistry

Biology

Math

Physics

Business

Social Sciences

Programming

Product & Marketing

In the lac operon, what are the likely effects on operon gene transcription of the mutations described in a–e?Mutation of consensus sequence in the lac promoter

In the lac operon, what are the likely effects on operon gene transcription of the mutations described in a–e?

Mutation of consensus sequence in the lac promoter