[Campbell Biology P.1002] According to Figure 43.2, what is the correct sequence of events du... | Practice Question
According to Figure 43.2, what is the correct sequence of events during phagocytosis by a typical phagocytic cell?
A: Pseudopodia surround pathogens → Pathogens are engulfed by endocytosis → Vacuole forms → Vacuole and lysosome fuse → Toxic compounds and lysosomal enzymes destroy pathogens → Debris from pathogens is released by exocytosis.
B: Pathogens are engulfed by endocytosis → Pseudopodia surround pathogens → Vacuole forms → Vacuole and lysosome fuse → Debris from pathogens is released by exocytosis → Toxic compounds and lysosomal enzymes destroy pathogens.
C: Vacuole forms → Pseudopodia surround pathogens → Vacuole and lysosome fuse → Pathogens are engulfed by endocytosis → Toxic compounds and lysosomal enzymes destroy pathogens → Debris from pathogens is released by exocytosis.
Explanation
Figure 43.2 clearly labels the sequence of events during phagocytosis: 1 Pseudopodia surround pathogens, 2 Pathogens are engulfed by endocytosis, 3 Vacuole forms, enclosing pathogens, 4 Vacuole and lysosome fuse, 5 Toxic compounds and lysosomal enzymes destroy pathogens, and 6 Debris from pathogens is released by exocytosis.