Mitochondria are often described as the powerhouses of the cell because of their central role in the synthesis of ATP, a vital source of energy for the body. They are composed of a double membrane, intramembranous space, and matrix. Various mitochondrial types can be differentiated based on the inner membrane structure.
Structure
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The structure and DNA of mitochondria resemble the structure and DNA of prokaryotes. Mitochondria are believed to have been prokaryotes originally that evolved into endosymbionts living inside eukaryotes
Mitochondrial membrane
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There are two, highly specialized mitochondrial membranes that surround the mitochondrion. They provide the framework for the electron transport chain and ATP production.
Outer membrane
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Structure: smooth
Permeability: interspersed with pores, highly permeable for various molecules
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