Unit 3 · Cells as a System
Twenty-five questions. Tap an answer and it moves on by itself — correct answers advance immediately, misses hold a few seconds so you can read why. Several questions come with a diagram to read.
1C.1Organelles, what each one does, and how they work together1C.2Prokaryote vs. eukaryote; plant, animal, and fungal cells1C.3Why a virus is built differently from a cell — and needs one