Transcriptional regulation of operon gene expression involves the...

Question

Transcriptional regulation of operon gene expression involves the interaction of molecules with one another and of regulatory molecules with segments of DNA. In this context, define and give an example of each of the following:

negative regulation

Accepted Answer

Hello, everyone and welcome to today's video. So, a strain of E coli is mutant to the gene coating for the lac repressor protein. What advantage does this have over the A W type E coli strain when lactose is present in the medium? Well, remember that lactose is going to be used for energy or just for growth. If this lack repressor protein is lacking, then this means that lactose is going to be just continuously transcribed and translated or the lac operon is going to be continuously transcribed and translated when lactose is present, resulting in a higher rate of lactose utilization or just metabolism. Now, let's go over each of our answer choices from A through D so that we may solve this problem as answer choice. A if we have the mutant strain will have a lower growth rate compared to the wall type strain. Well, remember that the rate of lactose utilization is going to increase. So this strain is going to be able to have a higher growth rate. So we're going to cancel this answer choices out. Then we have b the immune strain will not be able to utilize lactose as a carbon source. Well, this is actually going to be incorrect because there is nothing really affecting its lactose utilization. It will be able to utilize lactose as normal. We're going to also cancel it out. Then we have the the beaten strain will have a lower lactose uptake rate compared to the wall type strain. But remember that the rate of lactose uptake is not affected by the absence of the lac repressor protein. So we're also going to cancel this out. Finally, we have seen this is our last answer choice. The mutant strain will have a higher growth rate compared to the wall type strain. Well, as we mentioned in a mutant strain of E coli that is unable to produce the lack repressor protein. The operon is going to always be expressed, meaning that the operon will be transcribed and translated even when lactose is present. And this is going to result in a higher growth rate compared to the wall type strain. This is actually going to be a correct answer choice and we're going to highlight answer choice. C the mutant strain will have a higher growth rate compared to the wall type strain. As a final answer to our video. I really hope this video helped you and I hope to see you on the next one.

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Transcriptional regulation of operon gene expression involves the interaction of molecules with one another and of regulatory molecules with segments of DNA. In this context, define and give an example of each of the following: negative regulation