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CAIE A Level Biology 9700 · Cell structure

Cell structure: explain question

Explain5 marksChallenge

A student observed two cell types, X and Y, using an electron microscope. The table below shows the structures observed in each cell type.

StructureCell XCell Y
Nucleusabsentpresent
Ribosomes70S80S
Mitochondriaabsentpresent
Cell wallpresent (peptidoglycan)absent
Circular DNApresentabsent (linear chromosomes)
Size~2 μm~20 μm

Explain which cell (X or Y) is prokaryotic and which is eukaryotic. Then explain how the differences in their structure, particularly regarding energy production, relate to their functions and size.

0 words · 5 marks

No account needed for your first marks. Your answer is used only to mark it.

How this question is marked

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.

Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.

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