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AP Biology

Examples, videos & experiments that are suitable for Biology.



Biology Introduction
Introduction to AP Biology and the four major themes in Biology. The concepts of evolution, free energy, information and systems.
AP Biology Test: A User Guide
Tips for the AP Biology Test. Tips for answering multiple choice and free response questions are included. Sample questions from old AP tests are also included.



Water: A Polar Molecule
Why water is a polar molecule. He also explains why this gives water properties like cohesion, high specific heat, less dense ice, and the ability to act as a solvent. All of these properties are due to hydrogen bonding.
How the polarity of water makes life on the planet possible. Oxygen is highly electronegative and pulls the electrons closely creating a partial negative charge. The polarity of water (and the corresponding hydrogen bonds) create cohesion, adhesion, capillary action, high specific heat, and a universally good solvent.


Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.


You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.


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