Youtube videos for AS old unit 2 topics – cell biology, genetics etc. (old spec)
Videos covering revision of new A2 (year 2) AQA course, presented by a recent student, you need to sign up to site to watch them.
Youtube Channel, 140 biology videos here, explained by a teacher. Not particularly aimed at A level spec, but many of a similar level, all sorts of topics for year 12 and year 13.
Lots of biology videos, this is US site so are aimed at AP Biology rather than A level, but many are useful.
Revision videos on Youtube from a Biology teacher, includes biological molecules and movement across membranes, lots of new ones now added including exam technique and topics for new AQA spec.
A level biology videos explained by biology students. Concise and useful information, many topics (this says OCR but most will cover AQA as well).