Which of the following nitrogenous bases are common for both $RNA$ and $DNA$?
$C, G, A$
$G, A, U$
$T, A, C$
$U, A, C$
The one which is capable of self replication is
Which amino acids are present in histones
Which of the following is incorrect for $DNA$ structure?
By using diagram, select the correct option for $X$ and $Y$
Which one of the following pair is a purine pair?