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Matrix - organic materials and store it in the form of...

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Matrix The matrix contains a variety of enzymes, ribosomes, and molecules of double- stranded DNA (usually circular). This nonchromosomal DNA is important because it encodes a small number of mitochondrial polypeptides that are integrated into the inner mitochondrial membrane together with polypeptides encoded by genes residing within the nucleus and imported from their site of synthesis in the cytosol. Observations of living cells show that mitochondria are dynamic organelles that change their shape, move from place to place within the cytoplasm, and undergo branching. Mitochondria arise by fission from pre-existing mitochondria. Mitochondria are often described as miniature power plants. They extract energy from
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Unformatted text preview: organic materials and store it in the form of electrical energy. Following glycolysis, [which occurs in the cytoplasm of the cell], the pyruvate is transported across the inner mitochondrial membrane and into the matrix where it is further broken down in the tricarboxylic acid cycle (Krebs cycle) . All but one of the enzymes used in this cycle are in the matrix- one is positioned in inner membrane. Krebs original description of the cycle was rejected in the 1930s by NATURE!! Final phase of aerobic cellular respiration is OXIDATIVE PHOSPHORYLATION which results in the largest net gain of ATP. ET [electron transport] chain is located in the inner mitochondrial membrane....
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