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Introduction:
Gene expression is the process involving synthesis of protein from a
Answer to Problem 1TYK
Correct answer:
Posttranscriptional regulation.
Explanation of Solution
Justification for the correct answer:
Option (d) is given as Posttranscriptional regulation. It controls the delivery of mRNA (messenger ribonucleic acid) after transcription to the cytoplasm. DNA (deoxyribonucleic acid) is transcribed in the nucleus and after mRNA is synthesized, it is transferred to the cytoplasm. This control is called posttranscriptional regulation. During this process, pre-mRNA processing takes place. In this, splicing of the introns occur, capping and tailing is done on the ends of the mRNA. This is done in order to protect the transcribed mRNA from getting degraded by the action of enzymes. Hence, option (d) is correct.
Justification for the incorrect answers:
Option (a) is given as translational regulation. Translational regulation controls the rate of protein synthesis. It manages the rate at which the mRNA is being used up for protein synthesis. So, it is an incorrect option.
Option (b) is given as posttranslational regulation. Posttranslational regulation controls the functioning of proteins synthesized during translation. The 3 ways of controlling are chemical modification, degradation, and processing. So, it is an incorrect option.
Option (c) is given as transcriptional regulation. Transcriptional regulation controls the genes that are transcribed into mRNA. So, it is an incorrect option.
Option (e) is deoxyribonucleic regulation. Deoxyribonucleic acid is the DNA molecule present in the nucleus. This does not control the delivery of mRNA to the cytoplasm.
So, it is an incorrect option.
Hence, options, (a), (b), (c) and (e) are incorrect.
Thus, it can be concluded that after DNA is transcribed in the nucleus, mRNA is synthesized, and the process that controls its delivery to cytoplasm is called posttranscriptional regulation.
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Chapter 16 Solutions
Biology: The Dynamic Science (MindTap Course List)
- Which of the following gene expression regulatory mechanisms saves the most energy but takes the longest to fully express the genes once signaled? a. transcriptional regulation b. post-transcriptional regulation c. post-translational regulation d. translational regulationarrow_forwardDescribe the post-transcriptional modifications that occur in mRNA and tRNA.arrow_forwardRegarding transcriptional promoter sites, which of the following statements are true? Select one or more than one: a)They are located in the gene (DNA) whose information will be transcribed b)They are found at the 3 'end of the gene that will be transcribed c)Some of them are called 'TATA box' d)They are found in the DNA, 'upstream' of the gene to be transcribed. e)They are proteins of the cytoplasmarrow_forward
- What is meant by the term attenuation? Is it an example of gene regulation at the level of transcription or translation? Explain your answerarrow_forwardGene expression regulation by methylation of the cytosines in a promoter would be considered : Select one: a. Translational regulation. b. Transcriptional regulation. c. Posttranscriptional regulation. d. Posttranslational regulation.arrow_forwardDiscuss the role of GTP in the functioning of translational factorsarrow_forward
- Describe the three major modifications that occur duringthe processing of an mRNA.arrow_forwardFor each statement about gene expression mechanisms, choose the correct end to the sentence. For each gene, the template strand for transcription is determined by…. The direction of translation is determined by…… The tissue-specificity of protein production is determined by…. choices: a. location of the start codon b. location of the promoter c. direction of polymerization by RNA polymerase d. none of these e. direction of movement of ribosomes f. overall orientation of the chromosomearrow_forwardWhat is Post-Transcriptional Control, and why is it Important? Give an example, and explain the process.arrow_forward
- Define (whether post-transcriptional, post-translational, transcription) and describe the regulation of the Ferretin mRNA in the diagram below.arrow_forwardRegulation can occur at many steps in the pathway of gene expression. Briefly describe at least one example of a regulator at the level of: a) transcriptional initiation b) protein stability c) posttranslational protein modificationarrow_forwardDescribe and give an example of each of the following levels of gene expression control in eukaryotes: a) epigenetic control b) transcriptional control c) post-transcriptional control d) translational control e) post-translational controlarrow_forward
Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College