CAIE A Level Biology 9700 · Cell structure
A biologist extracts cells from two different organisms and records the presence (+) or absence (−) of the following components:
| Component | Cell P | Cell Q |
|---|---|---|
| Cell wall | + | − |
| Chloroplasts | + | − |
| Large permanent vacuole | + | − |
| Centrioles | − | + |
| Mitochondria | + | + |
| Rough endoplasmic reticulum | + | + |
| Golgi apparatus | + | + |
| 80S ribosomes | + | + |
| Nucleus with nuclear envelope | + | + |
Compare the two cells, stating which is likely from a plant and which from an animal, and explain your reasoning.
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.
Compare means: Give similarities or differences between two things, and say which side each point belongs to. Write each point as a pair, for example: A is X, whereas B is Y. Two separate descriptions rarely earn the marks.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.