CAIE A Level Biology 9700 · Biological molecules
Table 1 shows two molecules found in living organisms and their functions.
| Molecule | Function |
|---|---|
| A polysaccharide from a plant cell wall | Provides strength and rigidity to the cell |
| A lipid found in cell membranes | Forms a bilayer that acts as a barrier |
Describe how the structure of each molecule is adapted to its function.
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.
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