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The Evolution of Mitochondria

Micrograph of mammaliam mitochondria
In this transmission electron micrograph of mitochondria in a mammalian lung cell, the cristae, infoldings of the mitochondrial inner membrane, can be seen in cross-section.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, Eukaryotic Origins. October 16, 2013."
http://cnx.org/content/m44614/latest/Figure_23_01_01.jpg
OpenStax CNX
CC BY 3.0.