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Most oxidation reactions in microbial bioenergetics involve the

  • A.removal of electrons and hydrogens
  • B.addition of electrons and hydrogens
  • C.addition of oxygen
  • D.removal of oxygen

Answer: A

Correct answer: removal of electrons and hydrogens

In biological systems oxidation almost always means the removal of hydrogen atoms - each an electron with its proton - transferred to a carrier such as NAD+ or FAD. That is why the enzymes are called dehydrogenases. The older definition, addition of oxygen, describes only a minority of biological oxidations.

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