$RNA$ is different from $DNA$ because $RNA$ contains

Which components are present in a nucleotide?

Which is a bicyclic base?

The number of hydrogen bonds between guanine and cytosine; and between adenine and thymine in $DNA$ is

Assertion $(A)$: Adenine and guanine are present in $RNA$ as purine bases.
Reason $(R)$: The base uracil is present in $RNA$.
The correct option among the following is:

Uracil is a base present in $RNA$ with the following structure. The percentage of $N$ in uracil is $............$.
Given:
Molar mass $N = 14 \, g \, mol^{-1} ; O = 16 \, g \, mol^{-1} ; C = 12 \, g \, mol^{-1} ; H = 1 \, g \, mol^{-1}$.