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6. ------- can be easily broken if PH or temperature conditions change.

  • sulphur bridges
  • ionic bond
  • hydrogen bond
  • peptidebond

7. globular proteins are :

  • round, compact , insoluble
  • long, tightly coiled, soluble
  • round, compact ,soluble
  • long, tightly coiled, insoluble

8. which bond can be formed when O- AND NH3+ get close in polypeptide chains ?

  • ionic bond
  • disulfide bond
  • hydrogen bond
  • covalent bond

9. this level occurs in proteins of more than one polypeptide chain.

  • secondary
  • tertiary
  • quaternary
  • primary

10. ------ can link together with ------ bonds to form a polypeptide chain.

  • amino acids - peptide
  • amino acids - hydrogen
  • glucose - hydrogen
  • cellulose - peptide

11. collagen is a strong protein that forms connective tissue in animals. which type of 3D shape does it have ?

  • fibrous
  • globular

12. globular proteins are easily transported, because:

  • they are rope shape.
  • they are insoluble.
  • they are soluble.
  • they are long and tightly coiled.

13. haemoglobin is a ------ protein made of ----- polypeptide chain.

  • globular-four
  • fibrous-three
  • globular-one
  • fibrous-two

14. polypeptides are formed by :

  • hydrolysis - a molecule of water is formed
  • condensation reaction - a molecule of water is released
  • condensation reaction - a molecule of water is formed
  • hydrolysis - a molecule of water is released

15. a protein's ------ structure determines its 3D structure and properties.

  • tertiary
  • quaternary
  • primary
  • secondary