BBC - GCSE Bitesize - Biology
"GCSE Bitesize revision consists of a website, TV programmes, books, videos, CD-ROMs and uses digital interactive TV and mobile phones to offer students studying GCSEs in England, Wales and Northern Ireland extra revision support."
S-cool! - GCSE Biology Revision Guide
" S-cool is a site dedicated to school students."
BBC - Bitesize - SOS Teacher - Biology