In one complete turn of $B-DNA,$ how many purine $N_2$-bases are present?

Who proposed that for a double-stranded $\text{DNA},$ the ratios between Adenine and Thymine and Guanine and Cytosine are constant and equal to one?

The length of one full turn of $B-DNA$ is ....... (in $nm$)

Histones are enriched with $-$

How many base pairs of $DNA$ are present in the structure shown below?

Watson and Crick are known for their discovery that $DNA$