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

In his experiments on the chemistry of $DNA$,Chargaff estimated the base composition of human sperms and found that Adenine constituted $31\%$ and Guanine $19\%$. The quantity of Cytosine in the $DNA$ of human somatic cell is likely to be (in $\%$)

Histones are rich in the basic amino acid ............... and ...............

What type of bond exists between $A$ (Adenine) and $T$ (Thymine)?

The function of histone proteins in the nucleus is:

Statement $P$: Uracil is not present in the structure of $DNA$.
Statement $Q$: $A-T$ complementary base pairing is present in the structure of $DNA$.