In the structure of $DNA$,which bond connects $Adenine$ with $Thymine$?

What is the length of one full turn of the $DNA$ helix?

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 $\%$)

Thymine is present in which of the following?

If a double-stranded $DNA$ has $35 \%$ Guanine,calculate the percent of Thymine in the $DNA$. (in $\%$)

$A$ gene is defined as ...........