What is the length of one full turn of the $DNA$ helix?

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 common component in $DNA$ and $RNA$ is ......

What is the full form of $EtBr$?

How many hydrogen bonds connect adenine to thymine?

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