Molecular biology is concerned with the study of . . . . . .

If the base sequence in one strand of $DNA$ is "$ATCGA$", what is the total number of $H$-bonds present in the $DNA$ double helix?

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

Which one of the following shows a clover leaf model?

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 $m$)

When a chromosome,which appears like beads on a string,is observed under an electron microscope,what is this structure called?