Which of the following is not found in $DNA$?

Erwin Chargaff $(1950)$ estimated that . . . . . . .

Which of the following is not applicable to $RNA$?

The histone octamer is formed by the association of which proteins?

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

If the distance between two consecutive base pairs is $0.34 \, nm$ and the total number of base pairs of a $DNA$ double helix in a typical mammalian cell is $6.6 \times 10^{9} \, bp$,then the length of the $DNA$ is approximately: