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1) Enzymes can be described as a biological... a) organism b) catalyst c) key d) lock e) theory 2) What is the part of the enzyme called that fits onto the substrate? a) catalyst b) active site c) lock d) key e) reaction 3) What happens to the speed of an enzyme reaction if it gets too hot (according to this graph)? a) it breaks b) it gets faster c) nothing d) it gets slower 4) High temperatures change the shape of the enzymes active site and so it won't fit anymore - the enzyme is... a) broken b) malformed c) optimum d) denatured e) precribed 5) What else will slow down the speed of an enzyme reaction? a) the wrong pH b) the wrong equipment c) the colour of the indicator d) the day of the week e) how tired it is 6) What colour does iodine go when it touches starch? a) Brown b) orange c) red d) blue/black e) purple 7) What is the name of the enzyme that digests starch? a) protease b) lipase c) DNAase d) Ligase e) Amylase 8) What is the name of the small molecules produced when a protein is digested? a) sugars b) amino acids c) glycerol d) fatty acids 9) What is the name of the enzyme that turns a lipid into fatty acids and glycerol? a) protease b) amylase c) lipase d) carbohydrase 10) Benedict's solution starts off blue. It goes orange. What has it reacted with? a) sugar b) fat c) oil d) protein e) starch 11) Iodine goes from yellow/brown to blue/black. What has it reacted with? a) sugar b) fat c) oil d) protein e) starch 12) What is the name of the test for protein? a) Benedicts b) Iodine c) Emulsion d) Biuret's

GCSE Enzymes & Digestion

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