Ribose sugar is present in

Given below are two statements:
Statement $I$: $RNA$ mutates at a faster rate.
Statement $II$: Viruses having $RNA$ genome and shorter life span mutate and evolve faster.
In the light of the above statements,choose the correct answer from the options given below:

Describe in short about $RNA$.

Which of the following $RNA$ is non-functional?

What percentage of the total $RNA$ in a cell is $r-RNA$?

Identify the incorrect statement about $RNA$.