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9. Choose the correct option to fill in each blank: If no oxygen is available, all components of the mitochondrial electron t

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Answer #1
  • Electrons are transported across various components of electron transport chain (ETC), resulting in series of oxidation-reduction reactions.
  • NADH and FADH2 are electron donors, their oxidation creates high concentration energy from electrons.
  • . Inside cell or within the intracellular fluid, electrons are shuttled within different carrier molecules or electro transporters.

Complex I: NADH dehydrogenase:

Complex II: Succinate dehydrogenase

Complex III: Ubiquinol cytochrome C oxidoreductase

Complex IV: Cytochrome C oxidase

Complex V: ATP synthase.

  • Thus, if oxygen is absent, the electron will not be transferred to oxygen and the carrier proteins will remain in reduced form.
  • If oxygen is suddenly introduced, Cytochrome C will become oxideized beforre the NADH dehydrogenase, as oxygen act as terminal electron acceptor and accept electrons from cytocrome before complex I.
  • Answer:
  • Reduced
  • Oxidized, before
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