Textbook Question
Muscle cells differ from nerve cells mainly because they a. express different genes. b. contain different genes. c. use different genetic codes. d. have unique ribosomes.
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Ch. 18 - Regulation of Gene Expression
Chapter 18, Problem 5
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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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Post-Transcriptional Control
Post-transcriptional control refers to the regulation of gene expression after the transcription of DNA into RNA. This includes processes that modify the RNA molecule before it is translated into a protein, such as splicing, capping, and polyadenylation. These modifications can influence the stability, localization, and translation efficiency of the mRNA.
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01:56
Eukaryotic Post-Transcriptional Regulation
Introns and Exons
Introns are non-coding sequences of RNA that are removed during the RNA splicing process, while exons are the coding sequences that remain and are translated into proteins. The removal of introns and the joining of exons can lead to the production of different protein variants through alternative splicing, which is a key mechanism of post-transcriptional control.
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08:442) RNA Splicing Creates Mature mRNA
Gene Expression Regulation
Gene expression regulation encompasses various mechanisms that control the timing and amount of gene product (RNA or protein) produced in a cell. This regulation can occur at multiple stages, including transcription, RNA processing, translation, and post-translational modifications, allowing cells to respond to internal and external signals effectively.
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06:40Introduction to Regulation of Gene Expression
Related Practice
Textbook Question
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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Textbook Question
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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Textbook Question
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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Textbook Question
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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Textbook Question
Which of the following statements about the DNA in one of your brain cells is true? a. Most of the DNA codes for protein. b. The majority of genes are likely to be transcribed. c. It is the same as the DNA in one of your liver cells. d. Each gene lies immediately adjacent to an enhancer.
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