Dear Aspirant,

Yes, Off course you can!

First of all, there isn't a course called PhD Biotechnology separately, while writing CSIR NET, you should select the paper under Life Science. So, once you cleared CSIR JRF/NET with a good score, you can directly join for Research. While Joining you can select your area of interest (for e.g., biotech) and you may start your dream work.

All the very Best for your Future.