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2. Fibrous proteins are long chains of amino acids which are generally insoluble and inelastic. How is this beneficial for collagen?

  • Small arteries contract easily
  • Inelasticity allows muscles to contract. Long chains provide mechanical strength.
  • Muscles repair easily

3. Which type of bond holds the beta pleated sheet together?

  • Ionic bonds
  • Covalent bonds
  • Hydrogen bonds
  • Disulphide bonds

4. Which bonds hold the alpha helix together?

  • Ionic bonds
  • Hydrogen bonds between the -NH and -CO groups
  • Hydrogen bonds between the -NH groups
  • Covalent peptide bonds

5. 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
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