Nucleosome consists of

If a double stranded $DNA$ has $20$ per cent of cytosine, calculate the per cent of adenine in the $DNA$.

Nucleotides are linked by

The given figure shows the structure of nucleosome with their parts labelled as $A,\, B$ and $C$. Identify $A,\,B$ and $C$

In the $340 A^o$ long $DNA$ strand

Purines of $DNA$ are represented by