Q. 13 - Biology

Question

Which pre-mRNA processing step is important for initiating translation?

 a. poly-A tail

 b. RNA editing

 c. splicing 

d. 7-methylguanosine cap

Step-by-Step Solution

Answer

Option d is correct.

Step 1. Introduction

The process through which information encoded in mRNA is translated into amino acid during protein synthesis is known as translation.  

Step 2. Explanation of the correct option.

Option d is correct because a 7-methylguanosine cap is added at the 5' end of the mRNA and this process is known as the capping of mRNA. It occurs soon after the initiation step of translation. It is added to the 5' end of pre-mRNA to protect mRNA from degradation and help in translation.

Step 3. Explanation of the incorrect options.

Option a is incorrect because poly-A tail is added to the RNA at the end of the transcription.

Option b is incorrect because the RNA edition is a modification of RNA.

Option c is incorrect because Splicing is the excision of introns and the addition of Extron to form mature messenger RNA.