1) What are enzyes? a) Protein molecules that catalyse specific reactions in organisms. b) Lipid molecules that catalyse specific reactions in organisms. c) Carbohydrate molecules that catalyse specific reactions in organisms. d) Starch molecules that catalyse specific reactions in organisms. 2) What does catalyse mean? a) Slow down a reaction. b) Speed up a reaction. c) Keep a reaction the same. d) Nothing happens to cause a reaction. 3) Why are enzymes described as specific? a) Each enzyme only catalyses a specific reaction, because the active site only fits together with certain substrates (like a lock and key). b) Each enzyme catalyses many reactions, because the active site fits together with several substrates (like a skeleton key). c) Each enzyme only catalyses two reactions, because the active site only fits together with two substrates (like hands in gloves). d) Each enzyme only catalyses three reactions, because the active site only fits together with three substrates (like an induced fit). 4) Describe the function of amylase. a) To break down carbohydrates into starch. b) To break down lipids into glycerol and fatty acids.. c) To break down proteins into amino acids. d) To break down starch into simple sugars. 5) Where is amylase produced? a) Salivary glands. pancreas, and small intestine. b) Stomach, pancreas, and small intestine. c) Liver, salivary glands, and stomach. d) Gall bladder, liver, and salivary glands. 6) Describe the function of proteases. a) To break down starch into simple sugars. b) To break down lipids into fatty acids and glycerol. c) To break down proteins into amino acids. d) To break down carbohydrates into starch. 7) Where are proteases produced? a) Stomach, pancreas, and small intestine. b) Mouth, stomach, and small intestine. c) Liver, stomach, and pancreas. d) Pancreas, liver, and small intestine. 8) Describe the function of lipases? a) To break down proteases into amino acids. b) To break down starch into simple sugars. c) To break down carbohydrates into simple sugars. d) To break down lipids into fatty acids and glycerol. 9) Where are lipases produced? a) Liver and gall bladder. b) Pancreas and small intestine. c) Small intestine and stomach. d) Pancreas and gall bladder. 10) What are two factors that affect the rate of activity of an enzyme? a) Acidity and pH. b) Alkalinity and pH. c) Temperature and pH. d) Heat and time. 11) What does denatured mean? a) The shape of the enzyme's active site is changed by high temperatures or an extreme pH, so it can no longer bind with the substrate. b) The shape of the enzyme's dormant site is changed by high temperatures or an extreme pH, so it can no longer bind with the product. c) The shape of the enzyme's action site is changed by high temperatures or an extreme pH, so it can no longer bind with the substrate. d) The shape of the enzyme's specific site is changed by high temperatures or an extreme pH, so it can no longer bind with the product. 12) Describe the effect of temperature on enzyme activity. a) As temperature increases, rate of reaction decreases until it reaches the optimum for enzyme activity - above this temperature, enzyme activity increases and eventually levels out. b) As temperature decreases, rate of reaction increases until it reaches the optimum for enzyme activity - above this temperature, enzyme activity decreases and eventually stops. c) As temperature decreases, rate of reaction decreases until it reaches the optimum for enzyme activity - above this temperature, enzyme activity increases and eventually levels out. d) As temperature increases, rate of reaction increases until it reaches the optimum for enzyme activity - above this temperature, enzyme activity decreases and eventually stops. 13) Describe the effect of pH on enzyme activity. a) Different enzymes each have a different optimum pH at which their activity is lowest - at a pH much lower or higher than this, enzyme activity increases and levels out. b) Different enzymes each have a different optimum pH at which their activity is greatest - at a pH much lower or higher than this, enzyme activity decreases and stops. c) Different pH each have a different optimum enzyme at which their activity is greatest - at an enzyme much lower or higher than this, activity decreases and stops. d) Different enzymes each have a different optimum pH at which their activity is the same - at a pH much lower or higher than this, enzyme activity decreases and levels out.

Enzymes

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