1) How would you calculate the rate of an enzyme catalysed reaction? a) time/1 b) 1 x time c) 1 - time d) 1/time 2) Imagine you are investigating the effect of pH on the rate of oxygen given off by catalase. What would you plot on the x-axis of your graph? a) Volume of oxygen evolved b) Time c) Temperature d) pH 3) Imagine you are investigating the effect of pH on the rate of oxygen given off by catalase. What is the dependent variable in the investigation? a) pH b) Time c) Temperature d) Volume of oxygen evolved 4) Which of these would NOT be a control variable in this experiment? a) Enzyme concentration b) Temperature c) Substrate concentration d) pH 5) Why is it necessary to control temperature, e.g. with a water bath and thermostat? a) Because enzymes work best at their optimum temperature b) To make the experiment more reliable c) Because high thermal energy leads to more substrate-enzyme complexes forming d) Because the temperature needs to be kept stable at 37oC 6) How does a pH buffer work? a) Maintains a steady concentration of H+ ions b) It enables more enzyme-substrate complexes to form c) It maintains a steady rate of reaction d) It permanently denatures the enzyme 7) Which of these is NOT a good piece of advice when investigating rate of reaction in enzymes? a) If using whole pieces of tissue, keep the surface area the same as well as the mass b) Conduct sufficient repeats to identify any anomalous results c) Make sure you ignore any anomalous results d) Allow the temperature of the solution to equilibrate to the water bath temperature 8) Which of these would NOT be useful in investigating the effect of pH on hydrolysis of starch by amylase? a) Thermometer b) Colorimeter c) Biurase solution d) pH buffer 9) Which of these should you do before using a colorimeter? a) Calibrate it b) Equilibrate it c) Filter it d) Quantify it 10) Which word means using comparative samples to determine the concentration of a substance in a sample? a) Reduce b) Compare c) Assay d) Standardise

Biochemistry Quiz

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