General Biology sites
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Ivy without walls
Online tutorials on many aspects of A level biology (US site)
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Living cell tissue human body
Animations and diagrams on cell and body structure, along with some quizzes – bit of a strange site but contains some useful information
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Major differences
Really useful site if you want a straightforward and easy to follow list of differences between pairs of things – e.g. DNA and RNA, artery and vein.
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MIT open courseware
Many MIT courses available, free, online. This link is to “Fundamentals of Biology” but there is much more available here, video lectures, resources etc.
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Mosaic
Interesting articles on Biology and health topics from the Wellcome trust, good for background reading.
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Online learning centre
A textbook companion site with information, diagrams and quizzes arranged by topic