Question: 114. Given below are two statements:
Statement I: Transfer RNAs and ribosomal RNA do not interact with mRNA.
Statement II: RNA interference (RNAi) takes place in all eukaryotic organisms as a method of cellular defence.
In the light of the above statements, choose the most appropriate answer from the options given below:
(1) Both statement I and statement II are correct
(2) Both statement I and statement II are incorrect
(3) Statement I is correct but statement II is incorrect
(4) Statement I is incorrect but statement II is correct
Answer: Option (4)
Explanation:
During protein synthesis, transfer RNA interacts directly with mRNA through complementary base pairing between the anticodon of tRNA and the codon present on mRNA.
Ribosomal RNA also plays an essential role by forming the structural and functional core of the ribosome, which binds to and interacts with mRNA during translation.
Therefore, Statement I is incorrect.
RNA interference is a natural mechanism found in all eukaryotic organisms, where double-stranded RNA triggers the degradation of specific mRNA, thereby preventing translation.
This mechanism acts as a cellular defence against viruses and transposons.
Hence, Statement II is correct.