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What are lysosomes, peroxisomes and centrosomes? Write their functions.

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Lysosomes: They are single- membrane small vesicular structures, found in the cytoplasm of all eukaryotic cells, except mammalian RBC’s. They contain enzymes and are formed by Golgi apparatus. 

Functions: They are involved in intracellular digestion of foreign food or microbes and are also involved in autolysis or self-digestion of cells, after their death. 

Peroxisomes: They are found in photosynthetic cells of plants, liver and kidney cells of the vertebrates and contain two types of oxidative enzymes: oxidase and catalase, bounded by a unit membrane. 

Functions: These are involved in the removal of toxic substances, by oxidative reactions. In plant cells, these also help in photorespiration. 

Centrosome: A centrosome is a light microscopic organelle, formed of two dark, coloured granules called centrioles, surrounded by a transparent cytoplasmic area called centrosphere. It lies near the nucleus and is commonly called the call centre. 

Functions: Centrosome helps in cell division, in animal cells. They also help in the formation of cilia and flagella of the cells.

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