Courses
Teacher-curated, self-paced courses. Looking for a guided sequence through a full topic? See Learning Paths.
2 courses
The Cell Membrane, Wall and Endomembrane System
Biology · High School (11–12) · Cell Structure and Organelles, Transport Across the Cell Membrane
FreeCh 7 · 2/3
The fluid mosaic model of the cell membrane and how things cross it, the plant cell wall, and the endomembrane system: endoplasmic reticulum, Golgi apparatus, lysosomes and vacuoles.
3Lessons10Problems2Python Labs1Question Set1Mock Test
How Substances Move In and Out of Cells
Biology · High School (9–10), General · Transport Across the Cell Membrane
FreeCh 1 · 2/2
A raisin swells in water. A lettuce becomes crisp in a bowl of water. A drop of ink spreads without stirring. In this course we learn the two ideas behind all of this, diffusion and osmosis, and we test them with a potato.
3Lessons8Problems2Python Labs1Question Set1Mock Test