intparent:

Following are some summer programs that focus on Biology and Chemistry. Some of them become very difficult to get into if the student does not have prior research experiences. They are also pretty expensive except RSI which is free (even more competitive).

UC Davis Young Scholars Program
http://ysp.ucdavis.edu/

Research internship and HS Honor program at Boston University
http://www.bu.edu/summer/high-school-programs/

University of Chicago RIBS
https://summer.uchicago.edu/ribs.cfm

RSI at MIT
http://www.cee.org/programs/rsi