CAIE A Level Biology 9700 · Cell membranes and transport
The cell surface membrane is composed of a phospholipid bilayer with proteins, cholesterol, glycolipids and glycoproteins. Outline the structure of the membrane according to the fluid mosaic model, explaining the roles of phospholipids, cholesterol, glycolipids and glycoproteins. Outline the main stages of cell signalling involving membrane receptors.
7 marks, so the mark scheme is looking for about 7 separate creditworthy points. Making the same point twice in different words earns it once.
Outline means: Give the main points briefly. Less detail than describe, but every key step has to be there. One short line per step, in order. The marks are for coverage, not depth.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.