The use of living organisms for human welfare is called......

Which of the following are used in $MRI$ to detect physiological changes in living tissues?
$(i)$ $UV$ rays $(ii)$ Strong magnetic fields $(iii)$ $\gamma$-rays $(iv)$ $X$-rays

First biochemical to be produced commercially by microbial cloning and genetic engineering is:

Give the full form of $CT$ and $MRI$. How are they different from each other? Where are they used?

How was insulin obtained before the advent of $rDNA$ technology? What were the problems encountered?

Abnormal genes are replaced by normal genes through: