Assertion: Biotechnology produces transgenic micro-organisms that acts as microfactories for proteins.
Reason: To produce proteins of human use like insulin transgenic microorganisms can be developed.

Both Assertion (A) and Reason(R) are correct but R is not the correct explanation of A.

By inserting genes (or desired protein products transgenic micro-organisms can be developed using recombinant DNA technology. These transgenic organisms acts as living microfactories that produce proteins like human insulin, human growth hormone, etc. Production of proteins from such organisms is easier, more efficient and cost effective.