In one nucleosome,which one of the following histone molecule is $NOT$ double?

The successive nucleotides of $RNA$ are covalently linked through which of the following bonds?

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

Why are histones considered basic proteins?

Study the following statements regarding the number of base pairs $(bp)$ in various organisms:
$(I)$ Bacteriophage lambda has $48502$ base pairs $(bp)$.
$(II)$ $E. \text{ coli}$ has $4.6 \times 10^6$ $bp$.
$(III)$ Haploid content of human $DNA$ is $3.3 \times 10^9$ $bp$.
Identify the incorrect statement.

Which purine and pyrimidine bases are linked together by $H$-bonds in $DNA$?