In the structure of $DNA$,with which nitrogenous base does adenine $(A)$ always pair?

Identify the correct sequence of genetic material in descending order of size (from largest to smallest).

How many nucleotides are present in one turn of $DNA$ helix (in $pairs$)?

What is the full form of $DNA$?

Assertion $(S)$: $RNA$ does not contain $T$ (Thymine).
Reason $(R)$: $DNA$ does not contain $U$ (Uracil).

Given below are two statements:
Statement $I$: In prokaryotes,the positively charged $DNA$ is held with some negatively charged proteins in a region called nucleoid.
Statement $II$: In eukaryotes,the negatively charged $DNA$ is wrapped around the positively charged histone octamer to form nucleosome.
In the light of the above statements,choose the correct answer from the options given below: