Question

Using your knowledge of cellular respiration, provide a detailed accounting of the ATP produced. Be sure to include the exact contribution of the electron carrier molecules NADH and FADH2 and how this relates to ATP production.

Answer 1

                      Cellular respiration is a set of metabolic reactions and processess that take place in the cells of organisms to convert chemical energy from oxygen molecules or nutrients into Adenosine triphosphate (ATP), and then release waste products. Glycolysis , Krebs cycle and Electron transport system in mitochondria are main processess where ATP being produced

                     In glycolysis , 1 NADH2 molecule ,and 3 ATP molecules are produced but also 2 ATP are also assimilated for the initiation of this reaction. 1 NADH2 equals 3 ATPs ,so we get 4 ATP from glycolysis

                    In Kreb's cycle we obtain 3 NADH2 molecules , 1 FADH2 molecule and 1 ATP from 1 pyruvic acid from glucose.While considering assimilating 2 molecules of pyruvic acid we get 6 NADH2 , 2 FADH2 , 2 ATP from it . 1 FADH2 equals 2 ATPs. So net ATPs from Krebs cycle is equal to

                                           = (6*3)+(2*2)+2=24 ATPs

                    From electron transport chain we obtain total of 2 ATPs with help of accumulated protons combined with ATP synthase .

                          So totaly cellular respiration produces 30 ATP