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