Which scientists proposed the complete and systematic model of $DNA$?

The storehouse for all biological information is:

In a nucleoside,the nitrogenous base is attached to which carbon of the pentose sugar?

Match List-$I$ with List-$II$:

List-$I$	List-$II$
$a$. Bacteriophage $\phi \times 174$	$i$. $48502$ base pairs
$b$. Bacteriophage lambda	$ii$. $5386$ nucleotides
$c$. Escherichia coli	$iii$. $3.3 \times 10^9$ base pairs
$d$. Haploid content of human $DNA$	$iv$. $4.6 \times 10^6$ base pairs

Choose the correct answer from the options given below:

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 $\%$)

Genetic information is carried by long-chain molecules made up of