Why is it essential that bacterial cells be able to regulate the ...

Question

Why is it essential that bacterial cells be able to regulate the expression of their genes? What are the energetic and evolutionary advantages of regulated gene expression? Is the expression of all bacterial genes subject to regulated expression? Compare and contrast the difference between regulated gene expression and constitutive gene expression.

Accepted Answer

Welcome back. Let's look at our next question. Which of the following is a mode of gene expression that is modulated in response to environmental cues. Choice, a constitutive expression B regulated expression, C differential expression or D epigenetic regulation. Well, if we're looking for a mode of gene expression modulated in response to environmental cues, we're looking for is choice B regulated expression as that's the definition of regulated expression. But let's look at our other answer choices to understand why they're not correct in constitutive expression. Genes are expressed at a constant level in all cell types and under all conditions. So no variation in expression of genes no matter what. So that's why that's not our correct answer. Do I see differential expressions in which genes are expressed at different levels in different cell types under different conditions, but not necessarily in response to environmental cues. So it's a more generic uh description versus regulated expression, which is specifically meaning in response to environmental cues. So that's why C is not our answer, choice and then choice D epigenetic regulation. And this is when the chromatin structure is modified, for example, by methylation of the DNA in ways that can affect gene regulation. But again, like differential expression in both cases, these are not necessarily in response two environmental cues. Whereas again, that phrase of regulated expression specifically refers to environmental cues affecting gene expression. So that's why choice D is not correct. So which of the following is a mode of gene expression that is modulated in response to environmental cues. Choice B regulated expression. See you in the next video.

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