The Molecular Logic Project aims “to improve the ability of all students to understand fundamental biological phenomena in terms of the interactions of atoms and molecules”. They achieve this with an extensive database of online java-based simluations and models for students to use. The animations are simple, and there are a lot of activities to choose from. To make it work, you’ll need to install their software.

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Some highlights for IB Bio:

How do mutations affect protein folding?

How does gene mutation affect protein folding?

Sickle cell anemia

Cell growth and regulation

DNA

Properties of Water

And loads more here: Biology, Molecular Biology (Chem of life), Physics/Chemistry.