Review of Mitochondria StructureMitochondria are a main energy providing organelle in every living thing, within the mitochondria we have...
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Overview of Krebs Cycle
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Krebs Cycle in Depth
In short:
More complexly:
- Three carbon molecules from glycolysis get broken down in a bunch of chemical reactions. A low amount of ATP are made, as well as other types of energy carrying molecules. The waste product becomes carbon dioxide.
- Energy is then transferred to the next stage of cellular respiration.
More complexly:
- A pyruvate molecule is split into a two carbon molecule and a carbon dioxide molecule, that is given off as the waste. High energy electrons are transferred from the two carbon molecule to NAD+, which form a molecule of NADH. Next the NADH moves to the electron transport chain.
- A molecule called coenzyme A (coA ALSO KNOWN AS ACETYL coA) bonds with the two carbon molecule made because the pyruvate was broken down. This molecule then travels to the Krebs cycle. (This is the second step.)
- The two carbon part of the molecule is added to a four carbon molecule to form a six carbon molecule, which is called citric acid. Then coenzyme A goes back to step 2.
- The citric acid molecule is broken down because of an enzyme and a five carbon molecule is formed. A molecule of NADH is made and travels out of the Krebs cycle. Carbon dioxide is released as a waste product.
- The five carbon molecule is broken down by an enzyme. A four carbon molecule, a molecule of NADH, and a molecule of ATP are formed. The NADH travels out of the Krebs cycle. Carbon dioxide becomes the waste product.
- When the enzymes rearrange the 4-carbon molecule, high energy electrons are released and molecules of NADH and FADH2, electron carriers, are made. Then, the molecules leave the Krebs Cycle and the 4-carbon molecules stays.