It is absent in $RNA$.

..............is common for both $DNA$ and $RNA$ but.............is present only in $DNA$.

The minimum requirement for a mutation is a change in:

Which of the following sequences is used to determine phylogenetic history?

The genetic material in the bacterium $Escherichia$ $coli$ $(E. coli)$ is:

In his experiments on the chemistry of $DNA$,Chargaff estimated the base composition of human sperms and found that Adenine constituted $31\%$ and Guanine $19\%$. The quantity of Cytosine in the $DNA$ of human somatic cell is likely to be (in $\%$)