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6. What is a protein?

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

7. Is the amino group acidic or basic?

  • Acidic
  • Basic

8. Which bonds hold the alpha helix together?

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

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

  • Quaternary
  • Primary
  • Tertiary
  • Secondary

10. When one chain folds over on itself, this produces a __________

  • Beta-pleated sheet
  • Alpha helix
  • Double pleated sheet

11. Is the acid group acidic or basic?

  • Basic
  • Acidic

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

  • Disulphide bridges
  • Glycosidic bonds
  • Ionic bonds

13. How is a peptide bond formed?

  • Two amino acids are joined by a protein chain
  • Two amino acids are joined by a condensation reaction
  • Two amino acids are joined by a hydrolysis reaction

14. What is the formula of the amino group?

  • NH-2
  • NH
  • NH-3
  • NH-4

15. What bond is formed when amino acids join together by condensation?

  • A covalent peptide bond
  • An ionic peptide bond
  • A disulphide bond
  • A glycosidic bond

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

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

17. An enzyme is an example of a _______ structure

  • Tertiary
  • Primary
  • Secondary

18. Which three types of bonds help tertiary structures maintain their shape?

  • Ionic bonds, hydrogen bonds and disulphide bonds
  • Ionic bonds, covalent bonds and hydrogen bonds
  • Covalent peptide bonds and disulphide bonds