Who first suggested the idea of circular flow of genetic information?

Which of the following contains the essential enzymes for protein synthesis?

$A$ genetic mutation that does not result in a phenotypic expression is called a .....

Jumping genes are found in

What does $Y$ represent in the given figure?

Given below are two statements:
Statement $I$: Transfer $\text{RNAs}$ and ribosomal $\text{RNA}$ do not interact with $\text{mRNA}$.
Statement $II$: $\text{RNA}$ interference $\text{(RNAi)}$ 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.