Biologists think that endosymbiosis gave rise to mitochondriabefore plastids partly because(A) the products of photosynthesis could not be metabolizedwithout mitochondrial enzymes.(B) all eukaryotes have mitochondria (or their remnants),whereas many eukaryotes do not have plastids.(C) mitochondrial DNA is less similar to prokaryotic DNA thanis plastid DNA.(D) without mitochondrial CO2 production, photosynthesiscould not occur.

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Mitochondrial Mutations

A mitochondrion is a cellular organelle that serves as the site for cellular respiration and energy production (ATP or Adenosine Triphosphate). It is a double-membrane-bound organelle and is only present in eukaryotic cells.