Effect of Temperature on Enzyme Activity
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Questions and Answers

What happens to the rate of enzyme activity as temperature increases?

  • Reaches a plateau
  • Decreases
  • Increases (correct)
  • Remains constant
  • How does moving too far away from the optimum pH affect enzyme activity?

  • Reduces enzyme activity
  • Causes denaturation (correct)
  • No effect on activity
  • Enhances enzyme function
  • What is the typical optimum pH for most enzymes?

  • pH 9
  • pH 2
  • pH 7 (correct)
  • pH 5
  • How does low temperature affect enzyme function?

    <p>Slows down enzyme activity</p> Signup and view all the answers

    What effect does a high or low pH have on the bonds in enzyme proteins?

    <p>Breaks bonds</p> Signup and view all the answers

    What happens if an enzyme moves away from its optimum pH?

    <p>Denaturation of the enzyme</p> Signup and view all the answers

    What best describes the role of an enzyme?

    <p>A catalyst that speeds up reactions in cells, without being used up in the process.</p> Signup and view all the answers

    What is a common feature of all catalysts?

    <p>They are not changed by the reaction</p> Signup and view all the answers

    Which of the following correctly represents the effect of temperature on enzyme activity?

    <p>The higher the temperature, the higher the enzyme activity until the enzyme denatures</p> Signup and view all the answers

    At what pH level would an enzyme likely denature?

    <p>pH 11 (very basic)</p> Signup and view all the answers

    What happens to enzyme activity when it is denatured?

    <p>It decreases significantly</p> Signup and view all the answers

    Which statement accurately describes the optimal pH for enzyme activity?

    <p>Each enzyme has a unique optimal pH at which it works best</p> Signup and view all the answers

    What is the purpose of adding iodine solution in the enzyme investigation with amylase?

    <p>To test the enzyme activity by observing a color change</p> Signup and view all the answers

    Why is it important to use different pH values in the enzyme investigation?

    <p>To observe how pH affects enzyme efficiency</p> Signup and view all the answers

    What does it mean if the iodine solution remains orange brown after a short period in the enzyme investigation?

    <p>The enzyme is working optimally</p> Signup and view all the answers

    What happens to enzymes when they denature?

    <p>They lose their shape and activity</p> Signup and view all the answers

    Why is it important to start a stopwatch while mixing amylase and starch in the enzyme investigation?

    <p>To track the digestion process over time</p> Signup and view all the answers

    What is the significance of observing a blue-black color in the iodine solution during the enzyme investigation?

    <p>It means that starch has been completely digested</p> Signup and view all the answers

    Study Notes

    Effect of Temperature on Enzyme Activity

    • Increasing the temperature from 0°C to the optimum increases enzyme activity, as more energy leads to faster molecular movement and more collisions with substrate molecules.
    • Low temperatures do not denature enzymes, but make them work slower.

    Effect of pH on Enzyme Activity

    • The optimum pH for most enzymes is 7, but some enzymes have a lower optimum pH (e.g., pH 2 in the stomach) or higher optimum pH (e.g., pH 8 or 9 in the duodenum).
    • If the pH is too high or too low, the bonds holding the amino acid chain together can be destroyed, changing the active site shape and reducing enzyme activity.
    • Moving too far away from the optimum pH can cause enzyme denaturation and stop activity.

    Enzyme Investigations

    • Amylase is an enzyme that digests starch into maltose.
    • Iodine solution is used to test for starch.
    • Investigating the effect of temperature on amylase:
      • Starch solution is heated to a set temperature.
      • Iodine is added to wells of a spotting tile.
      • Amylase is added to the starch solution and mixed well.
      • The time taken for the reaction to be completed is recorded.
      • The experiment is repeated at different temperatures.
    • Investigating the effect of pH on amylase:
      • Place single drops of iodine solution in rows on the tile.
      • Use buffer solutions of different pH values.
      • Add amylase and starch solution to the buffer solution.
      • Use a pipette to place drops of the mixture on the iodine solution.
      • Repeat the experiment at different pH values.

    Exam Tips

    • Describing and explaining experimental results for enzyme experiments is a common type of exam question.
    • To score high, relate the results to changes in the active site of the enzyme when denatured or to the amount of kinetic energy the molecules have at low temperatures.

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    Description

    Learn about how temperature impacts the activity of enzymes and the rate of reactions. Find out why increasing temperature can lead to a faster rate of reaction and how low temperatures affect enzyme function.

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