The purine bases of $DNA$ are .....

In the structure of $DNA$,if one nitrogenous base is adenine,which nitrogenous base pairs with it?

What forms the backbone of a polynucleotide chain?

Telomerase is an enzyme that is a/an ....

Nucleosomes are the repeating units of chromatin; the part between adjacent nucleosomes is called . . . . . . .

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: