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Question

Which of the following is not a step in the process of breakdown of food by lysosomes?

A
Exocytosis
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B
Digestion of worn-out organelles
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C
Formation of phagosome
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D
Endocytosis
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Solution

The correct option is B Digestion of worn-out organelles

Breakdown of ingested food in cells occurs in 4 steps:

i. Endocytosis - Endocytosis is the entrapment of the food particle into the cell’s cytoplasm by the formation of a food vesicle around the particle.

ii. Formation of phagosome - The phagosome is the vesicle which is formed by the fusion of the cell membrane around the particle.

iii. Breakdown of food - The lysosome fuses with the vesicle, releases its enzymes and the food particle is then broken down by the action of enzymes.

iv. Exocytosis - The undigested food is then finally removed from the cell via exocytosis of the vesicle.


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