The three-dimensional structure of the $t-RNA$ molecule is . . . . . . .

Telomeric repetitive $DNA$ sequences control the function of eukaryotic chromosomes because they...

$A$ $DNA$ polymer has a free phosphate group at one end of the sugar,which is called the $P$ end of the polynucleotide chain. Similarly,at the other end of the polymer,there is a free $OH$ group of the sugar,which is called the $Q$ end of the polynucleotide chain.
$\quad P \quad Q$

$DNA$ is methylated at

How many hydrogen bonds are present between Guanine and Cytosine?

In $DNA$,how are the nucleotides linked together?