1) Respiration is a chemical reaction controlled by a) Acids b) Enzymes c) Hormones d) Cells 2) The shape of an enzyme is important a) True b) False 3) Substrates join to the enzyme's a) Passive site b) Active spot c) Active site d) Passive spot 4) At really high temperatures enzymes a) Die b) Are deactivated c) Are denatured d) Work best 5) The temperature at which enzymes work best is a) The best temperature b) The perfect temperature c) The optimum temperature 6) Between 0-40oC  a) The enzyme denatures b) The enzyme and substrate collide more frequently with increasing temperature c) The enzyme and substrate collide less frequently with increasing temperature d) The active site is distorted 7) At 50oC  a) The enzyme denatures b) The enzyme and substrate collide more frequently c) The enzyme and substrate collide less frequently d) The active site is distorted 8) At 63oC  a) The enzyme denatures b) The enzyme and substrate collide more frequently c) The enzyme and substrate collision less frequently d) The active site is distorted

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