【有氧英语】求有氧呼吸的英语定义.

【有氧英语】求有氧呼吸的英语定义.

【答案】 Aerobic respiration requires oxygen in order to generate energy (ATP).Although carbohydrates,fats,and proteins can all be processed and consumed as reactant,it is the preferred method of pyruvate breakdown in glycolysis and requires that pyruvate enter the mitochondrion in order to be fully oxidized by the Krebs cycle.The product of this process is energy in the form of ATP (Adenosine triphosphate),by substrate-level phosphorylation,NADH and FADH2
　　Simplified reaction:2C3 H6 O3 ΔG = -2880 kJ per mole of C6H12O6
　　The negative ΔG indicates that the reaction can happen spontaneously
　　The reducing potential of NADH and FADH2 is converted to more ATP through an electron transport chain with oxygen as the terminal electron acceptor.Most of the ATP produced by aerobic cellular respiration is made by oxidative phosphorylation.This works by the energy released in the consumption of pyruvate being used to create a chemiosmotic potential by pumping protons across a membrane.This potential is then used to drive ATP synthase and produce ATP from ADP.Biology textbooks often state that 38 ATP molecules can be made per oxidised glucose molecule during cellular respiration (2 from glycolysis,2 from the Krebs cycle,and about 34 from the electron transport system).However,this maximum yield is never quite reached due to losses (leaky membranes) as well as the cost of moving pyruvate and ADP into the mitochondrial matrix and current estimates range around 29 to 30 ATP per glucose.
　　Aerobic metabolism is 19 times more efficient than anaerobic metabolism (which yields 2 mol ATP per 1 mol glucose).They share the initial pathway of glycolysis but aerobic metabolism continues with the Krebs cycle and oxidative phosphorylation.The post glycolytic reactions take place in the mitochondria in eukaryotic cells,and in the cytoplasm in prokaryotic cells.

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