CAIE A Level Biology 9700 · Cell structure
Acinar cells in the pancreas secrete large quantities of digestive enzymes. Electron micrographs of these cells show extensive rough endoplasmic reticulum (rough ER) and a prominent Golgi apparatus.
Explain why a cell that secretes proteins contains abundant rough endoplasmic reticulum and a large Golgi apparatus.
4 marks, so the mark scheme is looking for about 4 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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