Cellular Respiration

Cellular Respiration Cellular Respiration is almost the exact opposite process of photosynthesis. The reaction for Cellular Respiration follows: C6H12O6 + H2O → 6CO2 + 6H2O + Energy

Stages of Cellular Respiration Stage 1: Glycolysis Stage 2: Aerobic Respiration

Glycolysis Anaerobic Process – does not require oxygen Glucose is broken down in the cytoplasm Two molecules of ATP and NADH are formed for each glucose molecule broken down

Glycolysis (continued) The NADH are converted into Pyruvate molecules Why is the net gain two ATP molecules instead of four in the process?

Aerobic Respiration There are two parts of Aerobic Respiration: Kreb Cycle Electron Transport

Kreb Cycle Pyruvate reacts with oxygen to give off energy and form carbon dioxide Also known as the citric acid cycle

Electron Transport Where most ATP is produced High energy electrons and hydrogen ions from the Kreb cycle are used to convert ADP to ATP What is different for cellular respiration in prokaryotics?

Anaerobic Respiration Respiration in the absence of oxygen Fermentation – glycolysis in the absence of oxygen Lactic Acid Fermentation Alcohol Fermentation

Lactic Acid Fermentation Enzymes convert pyruvate into lactic acid Occurs in human cells Used by microorganisms that produce foods (cheese, yogurt, sour cream)

Alcohol Fermentation Pyruvate converted to ethyl alcohol and carbon dioxide Occurs in yeast and some bacteria