The smallest structure having the power of replicating itself is:

$A$ small fragment of $DNA$ contains $80$ thymine and $90$ guanine bases. The total number of nucleotides will be:

Find the incorrect match.

According to Chargaff's rules for double-stranded $DNA$, which of the following ratios is not constant and varies between different species?

The segment of $DNA$ which acts as the instrumental manual for the synthesis of the protein is:

$X$-ray diffraction data was produced by ........ and ........