Early Aerobic Bacteria
Location: Outside U.S.
Date: Summer 2009
I know that cellular respiration in mitochondria needs both
the membranes of the mitochondria so as to maintain a proton motive gradient.
If the theory of endosymbiosis is true, then how did the primitive aerobic
bacteria with only a single membrane carry out respiration?
There can be a proton gradient across a cell membrane, not just across a
membrane within a cell. For example, certain bacteria and archaea have a
proton gradient across their membranes (inside vs. outside), and can still
respire without internal membranes.
Hope this helps,
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Update: June 2012