OCR Biology 'Proteins and Amino acids'

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1. Which bonds hold the alpha helix together?

  • Covalent peptide bonds
  • Hydrogen bonds between the -NH and -CO groups
  • Ionic bonds
  • Hydrogen bonds between the -NH groups
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2. Keratin contains many _______ between polypeptide chains adding strength.

  • Ionic bonds
  • Disulphide bridges
  • Glycosidic bonds

3. Is the amino group acidic or basic?

  • Acidic
  • Basic

4. What is a protein?

  • Something made of amino acids which has a distinct biological function
  • A chain of amino acids
  • More than one polypeptide chain

5. The function of a protein is determined by its _______ structure

  • Primary
  • Secondary
  • Tertiary
  • Quaternary


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