types of respiration
Answers
Answer:
two types of respiration
aerobic and anaerobic respiration
Answer:
There are two main types: aerobic and anaerobic.
Respiration - both aerobic and anaerobic - involves a "respiratory chain" – what is more usually referred to these days as an electron transport chain or electron transport system. The respiratory chain uses energy released by the flow of electrons from one carrier to another in a membrane in order to pump hydrogen ions unidirectionally across the membrane to form an electrochemical proton gradient. In fact, the protein complexes in the electron transport system were originally called “respiratory complexes”, and still are by many sources. The protons then flow back across the membrane through ATP synthase, which allows the enzyme to form ATP from ADP + Pi.
The key difference between aerobic respiration and anaerobic respiration is that in aerobic respiration the electron transport system's terminal electron acceptor is oxygen, whereas in anaerobic respiration the terminal electron acceptor of the electron transport chain is something other than oxygen, such as nitrate, nitrite, fumarate, DMSO, etc.
NOTE: Fermentation is an anaerobic process, but is not a form of anaerobic respiration. Fermentation does not involve an electron transport chain, does not generate an electrochemical gradient across a membrane, and does not use ATP synthase to produce ATP.
“Anaerobic Respiration
Under anoxic conditions, electron acceptors other than oxygen support respiration in certain prokaryotes. This is called anaerobic respiration. … As in aerobic respiration, anaerobic respirations require electron transport, generate a proton motive force, and employ ATP [synthase] to make ATP.
“Cellular respiration, or simply respiration, is defined as an ATP-generating process in which molecules are oxidized and the final electron acceptor is (almost always) an inorganic molecule. An essential feature of respiration is the operation of an electron transport chain. There are two types of respiration … In aerobic respiration, the final electron acceptor is O2; in anaerobic respiration, the final electron acceptor is an inorganic molecule other than O2 or, rarely, an organic molecule.”