A-LevelBiologyImmunity9700/12 · May/June 2025 · Q391 Mark
The statements describe the phagocytosis of a bacterium by a macrophage. 1 Digestive enzymes break down the bacterium. 2 Lysosome fuses with the vacuole. 3 Macrophage displays the bacterial antigens on its cell surface membrane. 4 Macrophage engulfs the bacterium and encloses it in a vacuole. 5 Receptors on the cell surface membrane of macrophage bind to the bacterium. Which order is correct for phagocytosis?
A3→5→4→1→2
B4→2→1→5→3
C5→4→2→1→3
D5→4→3→1→2
✓ Correct answer
C: 5→4→2→1→3
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