Respiration is the process by which organic molecules (mainly carbohydrates and lipids) are broken down; the energy released is used to produce ATP.
Anaerobic respiration occurs without the use of oxygen. It involves glycolysis with additional reactions (producing lactate in animals and bacteria, and ethanol in plants and fungi) to regenerate NAD+, so allowing continued production of ATP (for short periods)
Carbohydrate, lipid and protein can all be respired aerobically, with lipid yielding more energy per unit mass than carbohydrate. Only carbohydrate (glucose) can be respired anaerobically.
The respiratory quotient (RQ) can be used to determine the type of respiration and respiratory substrate.
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