State the characteristic feature of $DNA$ in organisms.

Genetic mutations occur in:

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 acidity of the $DNA$ molecule is due to:

If a chromosome contains $2,00,000$ base pairs,how many nucleosomes will it have (in $,000$)?

Histone proteins found in the nuclei of eukaryotes are: