In phagocytosis, what is the compartment formed when a phagosome fuses with a lysosome to digest the pathogen?

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Prepare for your Microbial Growth Phases, Oxygen Needs, and Immunity Types Test. Use our multiple-choice questions and detailed explanations for each answer to enhance your understanding and ensure success!

Multiple Choice

In phagocytosis, what is the compartment formed when a phagosome fuses with a lysosome to digest the pathogen?

Explanation:
The key idea is that digestion in phagocytosis happens in a specialized fused compartment called the phagolysosome. After a pathogen is engulfed, the phagosome that contains it fuses with lysosomes. This creates the phagolysosome, where acidic conditions and hydrolytic enzymes from the lysosome break down the pathogen, often aided by reactive oxygen species produced in the process. The other options don’t fit because an endosome is an earlier vesicle before lysosome fusion, a phagosome is the vesicle before fusion, and a lysosome is the separate enzyme-filled organelle, not the fused digestive compartment.

The key idea is that digestion in phagocytosis happens in a specialized fused compartment called the phagolysosome. After a pathogen is engulfed, the phagosome that contains it fuses with lysosomes. This creates the phagolysosome, where acidic conditions and hydrolytic enzymes from the lysosome break down the pathogen, often aided by reactive oxygen species produced in the process. The other options don’t fit because an endosome is an earlier vesicle before lysosome fusion, a phagosome is the vesicle before fusion, and a lysosome is the separate enzyme-filled organelle, not the fused digestive compartment.

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