OCR GCSE Biology B · J257
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: Cell MembranesBoth plant cells and prokaryotic cells, such as bacteria, have a cell membrane. It separates the inside of the cell from its surroundings. These cells also have a cell wall outside the membrane, but it is the partially permeable membrane that controls which substances can cross.
- Revise: Cell Membranes
Describes a membrane that allows some substances to pass through but not others.