1. Mitochondria have an outer membrane and an inner membrane that is invaginated into the inner matrix compartment. The invaginations are called "cristae" (though they are rarely "crest"-shaped). They usually expand into a paddle-shape from a restricted neck region, and carry respiratory and ATP-generating enzyme complexes. Mitochondria have some of their own DNA and are highly dynamic components, being moved by the cytoskeletal system of the cell and also undergoing fission and fusion. The set of stills is from a movie of a Cucurbita trichome mitochondrion, to demonstrate its plasticity of shape, fusion (see panels 2-4) and fission (see panels 7-9).

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