AP Biology 2006-2007 Anaerobic Respiration Stages: 1. Glycolysis 2. Fermentation yeast.
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Transcript of AP Biology 2006-2007 Anaerobic Respiration Stages: 1. Glycolysis 2. Fermentation yeast.
AP Biology 2006-2007
Anaerobic RespirationStages:
1. Glycolysis2. Fermentation
yeast
AP Biology
Anaerobic Respiration
Cellular Respiration (harvesting ATP from glucose) in the absence of Oxygen.
1. Bacteria that live in oxygen-free places
2. Some organisms that are exposed to oxygen, but switch to fermentation when oxygen is scarce.
AP Biology
Convert: glucose (6C) to 2 pyruvate (3C)
produces: 4 ATP & 2 NADH
uses:2 ATP
net yield: 2 ATP & 2 NADH
Glycolysis
ATP2
2
AP Biology
Pyruvate is a branching pointPyruvate
O2O2
mitochondriaKrebs cycle
aerobic respiration
fermentationanaerobicrespiration
AP Biology
FERMENTATION
Fermentation does not yield any more ATP than the tiny amount supplied by Glycolysis
It simply regenerates NAD, to refuel Glycolysis.
1. This is plenty of ATP for small anaerobic organisms
2. Not enough for large, multi-celled organisms
AP Biology
Lactate Fermentation
-Occurs in some bacteria AND animals for a quick fix of ATP
-Regenerates 2 NAD
-Produces 2 Lactates
(Lactic Acids)
pyruvate lactic acid3C 3C
NADH NAD+ back to glycolysis
AP Biology
Alcoholic Fermentation
-Occurs in bacteria, some plants, AND
some fungi (like yeast) for a quick fix of ATP
-Regenerates 2 NAD
-Produces 2 Ethanol (Alcohol) and
2 Carbon Dioxides
1C3C 2Cpyruvate ethanol + CO2
NADH NAD+ back to glycolysis