Q cycle
Q Cycle
The Q Cycle (pronounced: /kjuː saɪkəl/) is a series of biochemical reactions that take place in the mitochondria during the process of electron transport chain. The Q Cycle is named after the ubiquinone (coenzyme Q) that is involved in the process.
Etymology
The term "Q Cycle" is derived from the word "ubiquinone", which is often abbreviated as "Q". The "cycle" part of the term refers to the cyclical nature of the process.
Process
The Q Cycle begins when an electron is transferred from a protein in the mitochondrial membrane to a molecule of ubiquinone. This reduces the ubiquinone to ubiquinol, which then transfers the electron to another protein in the membrane. This process is repeated, creating a cycle of electron transfer that drives the production of ATP, the cell's main source of energy.
Related Terms
- Ubiquinone: Also known as coenzyme Q, it is a vital part of the Q Cycle.
- Electron Transport Chain: The process in which the Q Cycle takes place.
- Mitochondria: The organelle where the Q Cycle and other important cellular processes occur.
- ATP: The main energy currency of the cell, produced by the Q Cycle.
External links
- Medical encyclopedia article on Q cycle
- Wikipedia's article - Q cycle
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