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6. In the digestive system, glands secrete enzymes onto food this does what

  • splits large molecules into smaller ones
  • joins small molecules together

7. Amylase catalyses the breakdownthe breakdown of starch into sugars in the ...

  • mouth and liver
  • mouth and small intestine
  • liver
  • small intestine
  • mouth

8. Proteases catalyse the breakdown of ____ into amino acids in the stomach and the small intestine

  • starch
  • protein
  • oils
  • fats
  • water molecules

9. Stomach cells produce what kind of acid? This is to provide stomach enzymes with their optimum pH

  • actually its an alkali
  • hydrochloric
  • sulphuric

10. Lipases catalyse the breakdown of fats and oils into fatty acids and glycerol in the ___

  • small intestine
  • gall bladder
  • stomach
  • large intestine
  • liver

11. liver cells produce bile, stored into the gall bladder. Released into the small intestine this does what to the food from the stomach

  • makes the acidic food alkali
  • neutralises the acidic food
  • makes the neutral food acidic

12. Food takes about how long to pass through the digestive system?

  • 62 hours
  • 2-4 hours
  • 48 hours
  • 24 hours
  • 6-8 hours

13. Non-biological washing powders contain enzymes

  • False: biological washing powders contain enzymes
  • True
  • False: no washing powders contain enzymes

14. A gastric band (where people have their stomach temporarily made smaller by stapling a large part of it) works because:

  • appetite is reduced
  • it reduces their cravings for specific food types
  • the body works harder to digest food
  • the body works less hard to digest food

15. The detergent molecules make greasy stains soluble lifting them from the fabric and:

  • lipase break down fruit
  • protease enzymes digest protein (eg. in blood and egg)
  • protease enzymes digest protein (eg. in egg)

16. Toothpaste does not contain enzymes

  • False
  • True

17. Insoluble protein and fat stains are difficult to remove from fabrics. The cells of some microoganisms secrete enzymes. These are ____ and added to biological washing powders that also contain a detergent

  • purified
  • weakened
  • intensified

18. Saliva contains several enzymes and is ___

  • slightly acidic
  • slightly alkaline
  • very acidic
  • very alkaline
  • neutral

19. Enzymes are biological catalysts that speed up the rate of chemical reactions. How much of themselves is used up in this

  • None
  • Half
  • A small part
  • 100%
  • A large part

20. True or false. Some enzymes start digestion before food is swallowed. Others prevent the build-up to tooth-decay

  • True
  • False