Question

What processing step enhances the stability of pretRNAs and pre-rRNAs?

a. methylation

b. nucleotide modification

c. cleavage

d. splicing

Short answer

Option a is correct.

Step-by-step solution

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 a is correct because the methyl functional group is added to some bases of pre-RNA and pre-tRNA for stability. RNA methylation is the post-transcriptional level of regulation in which –CH₃ moiety or methyl functional group is added for stability. It regulates the transcription of mRNA, nucleation, stability, and translation and as a result, it overall controls the expression of the proteins.

Step 3. Explanation of the incorrect options

Option b is incorrect because the modified nucleotide occurs in all three forms of RNA.

Option c is incorrect because Cleavage refers to division or separation. it may be exonucleolytic - removing the end nucleotide, or endonucleolytic - splitting the strand in two,

Option d is incorrect because splicing is the excision of introns and joining of exons to form mature messenger RNA.