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Chapter 16: Q. 17 (page 415)

An unprocessed pre-mRNA has the following structure.

Which of the following is not a possible size (in bp) of the mature mRNA? a. 205bp b. 180bp c. 150bp d. 100bp

Short Answer

Expert verified

Option a is correct.

Step by step solution

01

Step 1. Introduction

Splicing is the process of excision of introns that is non-codding part of immature mRNA and the joining of the exon which is the coding region of mRNA occur to form mature messenger RNA.

02

Step 2. Explanation of the correct option

Option b is correct because after splicing only the exon part is remained, and intron parts are excised so the 110bps, 20bps, and 75bps sum are 205, hence 205bps never be the possible size of mature mRNA.

03

Step 3. Explanation of the incorrect options

Option b is incorrect because only the exon part is retained and introns are excised.

Option c is incorrect because only the exon part is retained and introns are excised.

Option d is incorrect because only the exon part is retained and introns are excised.

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