CAIE A Level Biology 9700 · Cell structure

Cell structure: explain question

Explain7 marksChallenge

Plasma cells are white blood cells that secrete large quantities of antibodies (proteins) into the blood. Electron micrographs of plasma cells show an extensive network of rough endoplasmic reticulum (rough ER) and a prominent Golgi apparatus. Explain why these organelles are so abundant in plasma cells.

How this question is marked

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.

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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