STD 12 - 8. microbes in human welfare — BIOLOGY STD 12 Science — Question

$A.$ Periodic abstinence

$B.$ Withdrawal

$C.$ Coitus interruptus

$D.$ Lactational amenorrhoea

$(a)\; DNA$ is negatively charged molecule and so it is loaded on gel towards the Anode terminal

$(b) \;DNA$ fragments travel along the surface of the gel whose concentration does not affect movement of $DNA.$

$(c)$ Smaller the size of $DNA$ fragment larger is the distance it travels through it.

$(d)$ Pure $DNA$ can be visualized directly by exposing UV radiation.

Choose correct answer from the options given below