|AP Cellular Respiration Lab Report | |Lab #3 | | | | | | | | | | | | | | | | | AP Cellular Respiration Lab Report
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Cellular respiration is the catabolic pathway that includes Glycolysis, Krebs cycle, and the Electron Transport Chain. The glycolysis and Krebs cycle portion of cellular respiration both use substrate-level phosphorylation while the electron transport chain uses oxidative phosphorylation. Cellular respiration can also include Alcohol or Lactic Acid Fermentation when it is in an anaerobic environment. Cellular respiration requires organic compounds to produce ATP unless photosynthesis has taken place before cellular respiration. Glycolysis is the process of breaking down glucose into two pyruvates and producing a total of 4 ATP and is broken down into two sectors: energy-investment and the pay-off Phase. Glycolysis as mentioned before performs substrate-level phosphorylation which basically means that phosphate is added to ADP by means of enzymes. The net gain of glycolysis is only 2 ATP since it consumes 2 ATP in the energy-investment phase. Glucose ends up breaking down into two pyruvates and these two pyruvates are transported into the mitochondrial matrix where the Krebs cycle is performed. Before pyruvate enters the Krebs cycle, it is transformed into a compound known as acetyl CoA which is what is accepted into the Krebs cycle. During the Krebs cycle, acetyl CoA produces 3 NADH, 3 H+, 1 ATP, and FADH2. The products of the Krebs cycle (NADH and FADH2) are then transported to the inner membrane of the mitochondrial membrane where the electron transport chain is located. Once the NADH and FADH2 have arrived at the electron transport chain, the NADH and FADH2 drops their electrons onto the electron transport chain. The electron transport chain is made up of FeS, FMN, and Cytochromes. The cytochromes include everything from Q to Oxygen in the ETC (electron transport chain). The electron is slowly transported to the oxygen over the different molecules that absorb the electrons energy. This is the part of cellular respiration that creates the most ATP. The electron transport chain creates a total of 34. The total amount of ATP that is created through cellular respiration is 38 but since there were two ATP that were consumed in the energy-investment of glycolysis reduces the net gain of cellular respiration to 36 ATP. Alcohol fermentation and Lactic Acid Fermentation are the other option that cellular respiration takes after glycolysis. Once the pyruvates are created, they are broken down...
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