The chemisosmotic hypothesis described that the process of ATP generation in the final stage of cellular respiration in the mitochondria namely. It is known as oxidative phosphorylation. This process was also discovered to take place in the thylakoids of chloroplasts as a means of generating ATP and reduced NADP in the light dependent reaction, key products needed for the light independent reaction to generate hexose sugars in plants. In both plants and animals, chemiosmosis are identical however there are a few subtleties in the creation of the proton gradient related to the electron transport chain.