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Peroxisomes - Vacuoles Vacuoles are membranous sacs similar...

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Peroxisomes Some metabolic processes within cells require the removal of hydrogen (oxidation) from certain molecules. For example, the breakdown of fatty acids often involves the removal of hydrogen. Peroxisomes are vesicles that contain enzymes which remove hydrogen from (oxidize) a variety of different compounds and pass the hydrogen to oxygen, producing hydrogen peroxide (H 2 O 2 ). Hydrogen peroxide is toxic but the enzyme catalase converts it to water and oxygen. 2H 2 O 2 2H 2 O + O 2 Peroxysomes within the liver are involved in detoxifying certain drugs such as alcohol.
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Unformatted text preview: Vacuoles Vacuoles are membranous sacs similar to, but larger than vesicles . Vacuoles store water and dissolved substances. They are more important in plant cells. Most of the center of a plant cell is occupied by a central vacuole. The central vacuole gives support because pressure within the vacuole makes the cell rigid (turgid). The cell wall prevents the cell from bursting. Some protists have specialized contractile vacuoles for eliminating excess water and food vacuoles that contain food within the cell....
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