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Ch. 18 - Regulation of Gene Expression
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All textbooksCampbell 11th EditionCh. 18 - Regulation of Gene ExpressionProblem 4

Chapter 18, Problem 4

Cell differentiation always involves a. transcription of the myoD gene. b. the movement of cells. c. the production of tissue-specific proteins. d. the selective loss of certain genes from the genome.

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Welcome back. Our next problem says differential gene expression and different types of cells results in their proliferation, differentiation, apoptosis or migration. Well, differential gene expression in cells is involves activating some jeans while leaving others dormant. And this establishes um different characteristics in different cells because you have some genes turned off and some genes turned on. So when we look at our choices we see A. Is proliferation which just means you know the the multiplication of cells. But here we're talking about um cells becoming different due to genes being expressed in different ways. So proliferation is not what we're looking for. Be differentiation. So differentiation involves cells becoming different from each other as a result of different genes being turned on and off. So Choice B. Is the appropriate answer here, differentiation is the result of this differential gene expression just to be thorough. We keep looking on choices apoptosis that's programmed cell death. So that's not our answer. As it's we're talking about not cell death but just specific genes being activated or silenced. And then Choice D. Is migration meaning the spread of cells to different parts of the body. But we're talking about cells becoming different. Not necessarily about they're moving to different places. So Choice D. Is not as correct as choice be. So our answer again is be differentiation. See you next time
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If a particular operon encodes enzymes for making an essential amino acid and is regulated like the trp operon, then a. the amino acid inactivates the repressor. b. the repressor is active in the absence of the amino acid. c. the amino acid acts as a corepressor. d. the amino acid turns on transcription of the operon.

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The functioning of enhancers is an example of a. a eukaryotic equivalent of prokaryotic promoter functioning. b. transcriptional control of gene expression. c. the stimulation of translation by initiation factors. d. post-translational control that activates certain proteins.

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Which of the following is an example of post-transcriptional control of gene expression? a. the addition of methyl groups to cytosine bases of DNA b. the binding of transcription factors to a promoter c. the removal of introns and alternative splicing of exons d. gene amplification contributing to cancer

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What would occur if the repressor of an inducible operon were mutated so it could not bind the operator? a. irreversible binding of the repressor to the promoter b. reduced transcription of the operon's genes c. buildup of a substrate for the pathway controlled by the operon d. continuous transcription of the operon's genes

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Absence of bicoid mRNA from a Drosophila egg leads to the absence of anterior larval body parts and mirror-image duplication of posterior parts. This is evidence that the product of the bicoid gene a. normally leads to formation of head structures. b. normally leads to formation of tail structures. c. is transcribed in the early embryo. d. is a protein present in all head structures.

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