# Chapter Three: Cell biology

### Cytoplasm - Energy producing organelles - The mitochondrion

The Mitochondrion

The mitochondrion is the site of aerobic respiration. Most of the key processes of aerobic repiration occur accross its inner membrane. One theory holds that they evolved from endosymbiotic bacteria.

Note the folded inner membrane

< Take a tour of the Mitochondrion. >

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