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- #National Eligibility Cum Entrance Test
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- #Cell Structure and Function
- #Class 11
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When a number of primary lysosomes fuse to clear the worn out organelles, ____ are formed.
Primary lysosomes
Secondary lysosomes
Autophagic vacuoles
Residual bodies
Answers (1)
Components of the Endomembrane System: Lysosomes and Vacuoles -
Lysosomes
- These are single membrane bound round or spherical organelles that function as digestive component and organelle-recycling facility of animal cells.
- They are not found in the plant cells.
- These were discovered by Christian de Duve in 1955.
- They contain hydrolytic enzymes that function at the acidic pH.
- Due to the presence of hydrolytic enzymes, they are also called suicidal bags.
Types of Lysosomes:
Lysosomes can occur in different forms within the same cell. This phenomenon is called polymorphism. There are four types of lysosomes:
(1) Primary Lysosomes: They are newly formed vesicles that are smaller in size and contain granules of hydrolytic enzymes.
(2) Secondary Lysosomes: These are formed when the food vacuole (phagosome) fuses with lysosome. The digestion of food occurs in here and the undigested food remains in the secondary lysosome.
(3) Residual Bodies: These are the lysosomes with undigested food material. They fuse with the plasma membrane and remove the debris through exocytosis.
(4) Autophagic Vacuoles: When a number of primary lysosomes fuse to clear the worn-out organelle, autophagic vacuoles are formed.
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When a number of primary lysosomes fuse to clear the worn out organelles, autophagic vacuoles are formed.
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