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
$31\%$
$19\%$
$38\%$
$68\%$
Genes are chemically
The chemical nature of chromosome is as follows
If the length of E. Coli $DNA$ is $1.36 \;mm$, calculate the number of base pairs in E. Coli.
The element absent in $RNA$ is
What background information did Watson and Crick have made available for developing a model of $DNA$ ? What was their contribution ?