the role of coenzymes

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7 Terms

1
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what is a coenzyme

  • a molecule that helps an enzyme carry out its function but not used in the reaction itself

  • eg CoA


2
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CoA role in link reaction

  • binds to the remainder of the pyruvate molecule (acetyl 2C) to from acetyl CoA

  • it then supplies the acetyl group to the krebs where it is used to continue aerobic respiration


3
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role of coenzymes NAD AND FAD

  • role as hydrogen carriers

  • when hydrogen atoms become available at different points during respiration NAD and FAD accept these hydrogen atoms

  • they then transfer the hydrogen atoms from different stges of respiration to the eletron transport chain on the inner mitochondrial membrane where hydrogen is removed from the coenzymes


4
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OILRIG for coenzymes

  • OILRIG: oxidation is loss, reduction is gain

  • when hydrogen atoms ar removed from coenzymes they are oxidised

  • when coenzymes gain a hydrogen they are reduced


5
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why are hydrogen ions and electrons important in the electron transport chain

  • role in the synthesis of ATP

  • electrons from NADH and FADH2 are given to the electron transport chain

  • hydrogen ions from reduced NAD and reduced FAD are released when the electrons are lost


6
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sources of reduced NAD

  • 2 from glycolysis

  • 2 from link reaction

  • (2×3) 6 from krebs


7
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source of FAD

  • 2 from krebs