In the lysogenic state,viral $DNA$:

The bond between the phosphate group and the hydroxyl group of sugar is........

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

How is the $DNA$ molecule useful to higher organisms?

In an experiment,$DNA$ is treated with a compound that intercalates between the stacks of nitrogenous base pairs. As a result,the distance between two consecutive base pairs increases from $0.34 \, nm$ to $0.44 \, nm$. Calculate the length of the $DNA$ double helix (which has $2 \times 10^9 \, bp$) in the presence of a saturating amount of this compound. (in $m$)

The genetic material of $\phi \times 174$ is