Peroxisomes, lysosomes and vacuoles

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Lysosomes and vacuoles• Lysosomes are vesicles produced by the Golgi apparatus.

• Lysosomes contain hydrolytic enzymes and are involved in intracellular digestion.

• Digestion within the cell disposes of worn-out cell parts and is necessary for cell rejuvenation.

• Vacuoles (large) and vesicles (small) are membranous sacs in the cell that store substances.

• Vacuoles and vesicles can store a variety of substances for the cell. Anything from water to plant pigments and toxic substances are stored in these membranous sacs.

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Peroxisomes• Peroxisomes are vesicles than contain enzymes to

oxidize organic substances like fats. In other words the use oxygen to break down molecules.

• The enzymes in these organelles produce hydrogen peroxide

• Hydrogen peroxide is broken down right away by the enzyme catalase into oxygen and water.

• Peroxisomes are abundant in the liver where they produce bile salts and cholesterol and break down fats.

Fig. 3.7