Biology · Bioenergetics

Oxidative phosphorylation is the final stage of cellular respiration, where most of the cell’s ATP is produced. This process occurs in the inner mitochondrial membrane and relies on an electron transport chain (ETC) and chemiosmosis.

Fermentation is a metabolic process in which organisms convert carbohydrates, like glucose, into energy without using oxygen. It occurs in anaerobic conditions (absence of oxygen) and is commonly used by cells when oxygen is scarce. There are several types of fermentation, the most notable being alcoholic fermentation and lactic acid fermentation.

Glycolysis is the first step in cellular respiration, where glucose, a six-carbon sugar, is broken down into two molecules of pyruvate, each containing three carbons. This process occurs in the cytoplasm of cells and does not require oxygen. Glycolysis generates a net gain of 2 ATP molecules (energy) and 2 NADH molecules (electron carriers) for each molecule of glucose.

Oxidative phosphorylation is the final stage of cellular respiration, where most of the cell’s ATP is produced. This process occurs in the inner mitochondrial membrane and relies on an electron transport chain (ETC) and chemiosmosis.

The oxidation of pyruvate to acetyl CoA is a crucial step in cellular respiration, linking glycolysis to the Krebs cycle (citric acid cycle). This process takes place in the mitochondrial matrix and is catalyzed by the pyruvate dehydrogenase complex.