In an experiment, $DNA$ is treated with a compound which tends to place itself amongst the stacks of nitrogenous base pairs. As a result of this, the  distancebetween two consecutive base increases. from $0.34- 0.44\,nm$ calculate the length of $DNA$ double helix $($ which has $2 \times 10^9\,bP)$ in the presence of saturating amount of this compound.

The substance that acts as connecting link between two generations is

The length of a helix of $DNA$ is

One turn of $DNA$ possesses

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