Free Radicals and Antioxidants in Biochemistry
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Free Radicals and Antioxidants in Biochemistry

Test your knowledge of free radicals, antioxidants, and redox chemistry with this quiz. Learn the basics of oxidation, reduction, oxidants, reductants, and the nature of free radicals in biological systems.

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Questions and Answers

What is the defining characteristic of a free radical?

It contains one or more unpaired electrons

What does oxidation involve?

Gain in oxygen

What is the role of reductants?

Reduces another chemical compound by donating electrons, hydrogen

What makes free radicals highly reactive?

<p>They are unstable and try to become stable</p> Signup and view all the answers

How are free radicals represented?

<p>By a superscript dot to the right (R.)</p> Signup and view all the answers

Study Notes

Free Radicals

  • Defining characteristic: having one or more unpaired electrons, making them highly reactive
  • Oxidation involves the loss of one or more electrons, resulting in the formation of a free radical

Reactivity of Free Radicals

  • Highly reactive due to the presence of unpaired electrons, which seek to form a bond with other molecules
  • This reactivity leads to a chain reaction of oxidation, causing damage to cells and molecules


  • Play a crucial role in counteracting the effects of free radicals by donating electrons
  • Reduce the oxidation state of a molecule, thereby neutralizing the free radical

Representation of Free Radicals

  • Often represented by a dot (•) or an asterisk (*) symbol, indicating the presence of an unpaired electron
  • Chemical structure is typically denoted with a dot or asterisk beside the symbol of the atom or molecule

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