In TS PGECET, MSc Biotechnology is mainly offered for students with B.Sc. background, but admission rules vary by university. Some universities like Osmania and Kakatiya do offer MSc Biotechnology seats through PGECET, so yes it is possible. About the counseling form, if only MSc option is showing, it may be a technical issue. Since you are a B.Sc. Biotechnology graduate, you are eligible, but you should clarify with the PGECET helpline or check the official information booklet before applying.