Unit 4 · 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 ask you to read a diagram or a data table.
1D.1Proving the membrane is semipermeable — designing it, and reading the mass data1D.2Osmosis and tonicity: which way water moves, and what happens to the cell