Organisms and Populations — BIOLOGY STD 12 Science — Question

$(a)\; DNA$ 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

$i$. Birth control pills are likely to cause cardiovascular problem

$ii$. A woman who substitutes or takes the place of the real mother to nurse to embryo is called surrogate mother

$iii$. Numerous children have been produced by in vitro fertilisation but with some abnormalities

$iv$. Woman plays a key role in the continuity of the family and human species

$v$. Foetal sex determination test should not be banned

$I.$ Anabaena

$II.$ Oscillatoria

$III.$ Nostoc

Choose the correct option