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Anaerobic Processes
Anaerobes
&
Fermentation
Anaerobic Respiration

Takes place without oxygen

Performed by some prokaryotes living in
anaerobic environments



Stagnant ponds
Intestines
Waterlogged soil

Glycolysis begins process


ATP made (2 net)
NADH

Electrons from NADH move down ETC

Molecules other than O2 are final eacceptors


NO3SO42-

ETC coupled to ATP synthesis by
chemiosmosis

End products of anaerobic respiration are:




CO2
Reduced inorganic substances
ATP
Example:
C6H12O6 + 12 KNO3 
6 CO2 + 6 H2O + 12 KNO2 + ATP
Fermentation

Anaerobic pathway without ETC

Performed by:




Some bacteria
Fungi
Muscle cells
Only 2 ATPs made per glucose
Fermentation Overview

Glycolysis cannot continue indefinately because
there is a limited # of NAD+

Once all NAD+ is reduced to NADH, glycolysis
stops

In fermentation, NADH transfer H to organic
molecules


Regenerates NAD+
Keeps glycolysis going
2 Types of Fermentation