Question

Which of the following RNAs is not required for the synthesis of protein?

• A. rRNA
• B. tRNA
• C. siRNA
• D. mRNA

Answer 1

The correct option is C siRNA

RNA stands for ribonucleic acid. It is a polynucleotide chain made of many 5-C compound ribose sugars, phosphates and nitrogenous bases (purines and pyrimidines).

There are different types and forms of RNA like rRNA, mRNA, tRNA which are required for the synthesis of proteins by the cell.

mRNA carries genetic information of DNA in the form of codons to the site of protein synthesis in the cytoplasm.

tRNA brings amino acids to the site of protein synthesis.

rRNA is a constituent of ribosomes. Ribosomes serve as the site for protein synthesis.

SiRNA is not required for the synthesis of proteins. Small interfering RNAs (siRNAs) acting via the mechanism of RNA interference are capable of recognizing a homologous mRNA sequence in the cell and induce its degradation. Hence, they interfere with the expression of specific genes by preventing the translation of mRNA.