Hey!

You can apply for GATE (life sciences) only after your masters. Those who pursue B.Tech. are eligible for GATE and can get admission in M.Tech.
Bachelor's in science students, on the other hand, can pursue M.Tech.  only after masters in science. Your class 12th with PCB is ok for this exam. Mainly your M.Sc. matters.
After your M.Tech., you can pursue your career in R&D companies, in research field, etc. You can also go for PhD in this field to work as an independent scientist later on or teach as an academician. You can also teach in schools after your M.Tech., can apply for government jobs, and can work in industries related to biological research.
Hope it helps!

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