In $DNA$,the linkages between different nitrogenous bases are

What does a nucleotide contain?

The $AT/GC$ ratio in human beings is (where $A = \text{adenine}$,$T = \text{thymine}$,$G = \text{guanine}$,$C = \text{cytosine}$)

The function of $DNA$ in an organism is

Which of the following correctly represents hydrogen bonded pairs in $DNA$?

$A$ segment of $DNA$ molecule which codes or specifies for one polypeptide chain is called: