1) Enzymes a) Lower the activation energy b) Increase the activation energy 2) Enzymes are biological catalysts a) They slow down the rate of reactions and are used up in the reaction. b) slow down the rate of the reaction but are not used up in the reaction c) speed up the rate of a reaction and are used up in the reaction d) speed up the rate of a reaction but are not used up in the reaction 3) The reaction takes place at the a) allosteric site b) active site c) all over the enzyme 4) Enzymes are described as specific because a) only one product fits in the active site b) the substrate fits in the active site c) only one substrate fits in the active site 5) Enzymes are made of a) DNA b) carbohydrate c) fat d) protein 6) Amylase a) Converts starch to glucose b) Converts glucose 1 phosphate to starch c) converts starch to maltose d) converts fat to fatty acid and glycerol 7) The substrate of phosphorylase is a) maltose b) glucose c) protein d) glucose 1 phosphate 8) The enzyme that breaks down hydrogen peroxide is a) catalase b) water c) oxygen d) amylase 9) The products of hydrogen peroxide breakdown are a) water and hydrogen b) hydrogen and oxygen c) water and oxygen d) oxygen and hydrogen 10) The pH and temperature at which enzymes work best is called the optimum a) True b) False 11) Enzymes work over a range of temperatures and pHs a) True b) False 12) The optimum pH for pepsin ( found in the stomach is) a) 7 b) 9 c) 5 d) 2.5 13) When enzymes become too hot they a) are denatured and will work when cooled down b) are denatured and will never work again 14) Enzymes are involved in a) synthesis and building up reactions b) degradation and breaking down reactions c) synthesis and degradation reactions

1.4 Enzymes

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