5-enzymes-qp_igcse-cie-biology_.pdf

1 Which graph shows the effect of temperature on the activity of an enzyme? 5 temperature /°C enzyme activity A B C 5 temperature/°C 0 100 enzyme activity 0 100 5 temperature /°C enzyme activity 0 100 5 ...

1 Which graph shows the effect of temperature on the activity of an enzyme? 5 temperature /°C enzyme activity A B C 5 temperature/°C 0 100 enzyme activity 0 100 5 temperature /°C enzyme activity 0 100 5 temperature /°C enzyme activity 0 100 2 The diagram represents enzyme action. + W + X Y What are parts W, X and Y in this chemical reaction? enzyme product substrate A W Y B X Y C X W D Y X Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/3 The diagram represents a chemical reaction. reactants product + Which diagram represents the enzyme for this reaction? A B C 4 The table shows the conditions in four test-tubes containing equal amounts of starch and salivary amylase. In which test-tube is the starch broken down fastest? pH temperature / °C A 2 27 B 2 37 C 7 27 D 7 37 5 What is true of all enzymes? they are sugars they are most effective at pH7 A   B   C   D   Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/6 The diagram shows the effect of an enzyme working in the human digestive system. enzyme at pH 1.5 amino acids and temperature 37°C protein What would reduce the rate of production of amino acids? A removing the amino acids as they are formed B increasing the amount of protein C raising the temperature to 40 °C D raising the pH to 7.5 7 Which group of compounds ensures that metabolic reactions take place effectively? A carbohydrates B enzymes C fatty acids D hormones 8 The diagram shows an experiment on the digestion of the protein in egg albumen by protease. The protease was taken from a human stomach. In which test-tube will the protein be digested most quickly? A B C D egg albumen + protease egg albumen + dilute hydrochloric acid egg albumen + dilute hydrochloric acid + protease egg albumen + dilute hydrochloric acid + boiled protease water-bath at 37°C Save My Exams! – The Home of Revisi