1. Why is a poly-A tail important? 2. What do introns do? Why do they exist in eukaryotes when they are mostly absent in prokaryotes? 3. What do you think 'alternative splicing' means, and how might it expand the function of a gene?

Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
ISBN:9781305251052
Author:Michael Cummings
Publisher:Michael Cummings
Chapter9: Gene Expression And Gene Regulation
Section: Chapter Questions
Problem 16QP: Given the following tRNA anticodon sequence, derive the mRNA and the DNA template strand. Also,...
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Only answer the follow up questions part c)

Once a primary RNA transcript is created from a DNA template, it must be modified in
several ways before becoming messenger RNA (mRNA), ribosomal RNA (rRNA) or
transfer RNA (tRNA). The following image shows RNA processing of one pre-mRNA
into mRNA. Note that pre-RNA is processed in three ways: 1) a 5' methylguanylate cap
(G cap) is added, 2) a poly-A tail is added, and 3) the spliceosome removes introns from
the pre-mRNA transcript. Please redraw the following diagram and label the following
on your diagram:
DNA
Promoter
pre-mRNA
(unprocessed)
mRNA
*5' methylguanylate cap
*polyadenylation
*Exon (may be more than one)
*Intron (may be more than one)
Transcription
RNA processing
AAAAA
PART C: FOLLOW-UP QUESTIONS
1. Why is a poly-A tail important?
2. What do introns do? Why do they exist in eukaryotes when they are mostly
absent in prokaryotes?
3. What do you think 'alternative splicing' means, and how might it expand the
function of a gene?
Transcribed Image Text:Once a primary RNA transcript is created from a DNA template, it must be modified in several ways before becoming messenger RNA (mRNA), ribosomal RNA (rRNA) or transfer RNA (tRNA). The following image shows RNA processing of one pre-mRNA into mRNA. Note that pre-RNA is processed in three ways: 1) a 5' methylguanylate cap (G cap) is added, 2) a poly-A tail is added, and 3) the spliceosome removes introns from the pre-mRNA transcript. Please redraw the following diagram and label the following on your diagram: DNA Promoter pre-mRNA (unprocessed) mRNA *5' methylguanylate cap *polyadenylation *Exon (may be more than one) *Intron (may be more than one) Transcription RNA processing AAAAA PART C: FOLLOW-UP QUESTIONS 1. Why is a poly-A tail important? 2. What do introns do? Why do they exist in eukaryotes when they are mostly absent in prokaryotes? 3. What do you think 'alternative splicing' means, and how might it expand the function of a gene?
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