By using electron transport system and oxidative phosphorylation steps, the cell utilizes energy stored in NADH + H+ and FADH formed during glycolysis and Krebs cycle. The Electron Transport System also called the Electron Transport Chain is a metabolic pathway present in the inner mitochondrial membrane, where electrons available from oxidation of NADH and FADH2… Read More »
The fate of pyruvic acid formed at the end of Glycolysis depends on the need of the cell and also on availability of oxygen. Organisms which grow in absence of oxygen – In anaerobic organisms, fermentation takes place after glycolysis. In presence of oxygen, aerobic respiration takes place where pyruvic acid from glycolysis enter Krebs’s… Read More »
Earth came into existence some 4.5 billions year ago and based on the fossil evidence from ancient rocks of Greenland, the life on earth dates to 3.7 billion years ago. The organisms that existed for the first two billions years, after the origin of life, were all anaerobic organisms. These organisms managed to survive and… Read More »