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Photosynthesis and Respiration for 500: Describe Aerobic Respiration. Scroll down to see answer. Takes place in the mitochondria Begins with Glycolysis, the splitting of glucose. The glucose breaks down into PGAL (with the help of 2 ATPs, leaves 2 ADP and 2 Phosphates), which turns into pyruvate (which the help of 4 ADPs and 4 Phosphates, leaves 4 ATPs). Glycolysis gains 2 ATP. The next step is to create Acetyl-CoA. Two pyruvates make two CO2s and two Acetic Acids. With the help of Coenzyme A (vitamin A) and NAD+, an extra hydrogen is removed and the acetic acids have Coenzyme A (CoA) attached, forming Acetyl-CoA. The Kreb�s Cycle comes next. Acetyl-CoA (2 carbons) and Oxalocetate (4 carbons) form citric acid (6 carbons), and an extra hydrogen and a CO2 are removed. Formed is Ketoglutaric Acid (5 carbons), and an ADP comes along, then leaves as an ATP. Another NAD+ leaves with another extra hydrogen, and another CO2 leaves. We are left with Succinic Acid (4 carbons), and three extra hydrogens are removed by FAD+ and NAD+, leaving us with Oxaloacetate. Two ATPs are formed. Now we follow the FAD+ and NAD+ (Now NADH and FADH2), as they lose electrons in the Electron Transport Chain. The electrons lose energy and make ATPs from it. The last electrons and two remaining hydrogens combine with oxygen to make water (H2O). We are left with 34 ATP. In total, we have 38 ATP: Two from glycolysis, two from Kreb�s Cycle, and 34 from Electron Transport Chain. C6H12O6 + 6 O2 ==> 6 CO2 + 6 H2O + 38 ATP | |