Cellular Respiration and Fermentation
Facts to Remember
Cellular respiration is a catabolic series of reactions.
All living forms conduct some form of cellular respiration, either aerobic or anaerobic. a.
Aerobic is in the presence of oxygen
Anaerobic is in the absence of oxygen or none oxygen requiring.
The starting molecules consist of the biological molecules with carbohydrates (monosaccharides) as the first choice. The order of use is given below. a.
Lipids³acetyl CoA (via beta oxidation)³ enters Krebs at the start site c.
Proteins³amino acids-³ enters glycolysis, transitional step or Krebs (point of entry is determine the carbon chain) d.
Nucleotides³five carbon sugars³ six carbon sugars
Cellular respiration and fermentation produce energy in the form of ATP and key intermediates needed for anabolic reactions. 5.
Cellular respiration and fermentation are redox reactions.
Model: Eukaryote Cell
Locations: cytoplasm, matrix of mitochondrion, inner mitochondrial membrane Starting Molecules: Glucose (monosaccharide), 2 ATP, oxygen, and 2 NAD+ End Products: 38-40 ATP, CO2, H20, FAD+ and NAD+ (from FADH2 and 2 NADH + H+ via electron transport)
Step I: Glycolysis (an anaerobic process)
Important steps are sited, please see textbook for full explanation.
Glucose to glucose-6-phosphate: 1 ATP energy input
Fructose-6-phosphate to fructose 1,6, bis-phosphofructose: Committal Step a.
Under allosteric regulation
Allosteric modulators: ATP and Citrate
Determines whether glycolysis will continue
1 ATP energy input
Fructose 1,6 bisphosphate is cleaved to form dihydroxyacetone phosphate (DAP) and glyceraldehydes 3 phosphate (G3P). a.
Cell prefers G3P, thus will ultimately convert DAP to G3P. Thus all reactions series from this point must be counted twice, once for G3P and secondly for DAP, after conversion.
G3P to 1,3 bis-phosphoglycerate
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