OCR Biology 'Proteins and Amino acids'

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1. 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
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Other questions in this quiz

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

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

3. Is the amino group acidic or basic?

  • Acidic
  • Basic

4. Keratin contains many _______ between polypeptide chains adding strength.

  • Ionic bonds
  • Disulphide bridges
  • Glycosidic bonds

5. A quaternary structure is made up of ________ polypeptide chain

  • More than one
  • One

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