$DNA$ is double helix and
$DNA$ is transcribed by some viral $RNA$ using the enzyme
In the $340 A^o$ long $DNA$ strand
Explain the role of scientist :
$1.$ Watson and Crick $(1953)$
$2.$ Erwin chargaff
If the length of E. Coli $DNA$ is $1.36 \;mm$, calculate the number of base pairs in E. Coli.