$A$ nucleoside is composed of:

The mobile genetic element is

Identify $X$ and $Y$ in the given diagram of a nucleosome.

In a $DNA$ molecule,one chain contains $22$ thymine and its opposite chain contains $28$ guanine. What is the length of this $DNA$ in $\mathring{A}$?

Describe the double helix structure of $DNA$ and explain how the sequences of the other strand are predicted.

Which sugar is present in the structure of $DNA$?