Description/definition of cellular respiration When an organism breaks down glucose and transfers glucose or chemical energyinto ATP or cellular energy/usable energy. Both plants AND animals use cellular respiration to transfer energy.
Process of Cellular Respiration Glycolysis Without O2 With O2 Krebs Cycle Alcoholic Lactic AcidFermentation Fermentation Electron Transport Chain
The First Process of Cellular Respiration Glycolysis• Occurs in the Cytoplasm• Does not require oxygen• Breakdown of glucose or glycogen• “Splitting of sugar”
Glycolysis• Series of 10 reactions• Glucose is split into two smaller molecules called PYRUVATE or pyruvic acid• 2 ATP are used but 4 ATP are produced• Net gain of ATP? 2 ATP molecules• Glycolysis ProcessC6H12O6 + 2ATP + 2NAD+ 2 Pyruvate + 4ATP + 2NADH + H+
Glycolysis AnimationClick on the link above to view the animation
Process of Cellular Respiration Glycolysis Without O2
Anaerobic Fermentation• Occurs in the cytoplasm• Does not produce ANY ATP• Regenerates NAD+ for reuse in glycolysis• Two types – Alcoholic Fermentation – Lactic Acid Fermentation
Alcoholic Fermentation• Plants Cells• Used to produce alcoholic beverages and to make bread• Pyruvic acid (pyruvate) is converted into ethyl alcohol, carbon dioxide, NAD+.• Alcoholic Fermentation Equation Pyruvic acid + NADH ethyl alcohol + CO2 + NAD+
Lactic Acid Fermentation• Animal Cells• Used to produce yogurt and cheese• Cause soreness in muscle cells• Pyruvic acid (pyruvate) is converted into lactic acid, & NAD+• Lactic Acid Fermentation Equation Pyruvic acid + NADH Lactic acid + NAD+
What’s the point of fermentation? Glycolysis – 2 ATP Fermentation – 0 ATP Total – 2 ATP• Regenerate the electron carrier, NAD+• NAD+ can allow for cellular respiration to continue
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