Videos
AP Biology
Pick a topic to watch.
8 video lessons
9:24
Topic 1
Chemistry of Life
Drop an ice cube into a glass and it floats. That sounds ordinary, but it is strange. Almost every other solid sinks in its own liquid, because freezing packs…
8:05
Topic 2
Cell Structure and Function
Look at a leaf under a microscope. You see rows of green boxes, and each box is packed with tiny green discs. Now look at a thin slice of onion. Neat brick…
7:58
Topic 3
Cellular Energetics
Look at the washing powder in your cupboard. In warm water it removes a food stain in half an hour. In a lab, the same job would need strong acid and boiling…
7:34
Topic 4
Cell Communication and Cell Cycle
Look closely. These are real cells, photographed in the middle of dividing. Inside your body, millions of new cells are made every second — skin, blood, gut…
7:53
Topic 5
Heredity
Two snails on the same tree. Same species, same bark, same weather. But look at the shells. One is pale with thin dark bands, the other dark with wide ones.…
8:40
Topic 6
Gene Expression and Regulation
That white thread in the tube is real DNA, pulled out of ordinary cells. It looks like nothing at all. But it holds every instruction your body will ever need.…
8:10
Topic 7
Natural Selection
This is a dish of bacteria. Each white disc holds a different antibiotic — a drug made to kill them. Look at the clear rings. A wide ring means the drug still…
7:53
Topic 8
Ecology
This reef holds more kinds of life in one hectare than a whole province of farmland. Every fish depends on the coral, and the coral on tiny algae inside it.…