HSA 2007 Biology Item 22print

HSA 2007 Biology Item 22

CID
CID42c461cff94a27af2668af6bfd6f04d3
itemNum
22
initialLetter
F
itemType
SR
itemAnswerKey
4
itemMaxScorePoints
1
origNum
x

Use the information and the graph below to answer the following question.

Catalase is an enzyme found in plant and animal cells. Hydrogen peroxide is a harmful substance found in cells. Catalase causes hydrogen peroxide to break down into water and oxygen.

A student conducted an experiment to determine whether plant and animal cells have the same amount of catalase. She used liver and potato tissues in the experiment. The student followed the procedures below.

  1. Label two identical test tubes, 1 and 2.
  2. Pour 10 milliliters of hydrogen peroxide solution (1% concentration) into each test tube.
  3. Add a small piece of liver tissue to Test Tube 1.
  4. Add a small piece of potato tissue to Test Tube 2.
  5. Collect the oxygen released from each test tube for 25 seconds.
  6. Measure and record the volume of oxygen for each test tube.

The graph below shows the results from the experiment.

Which of these factors was not controlled in the experiment?

  1. the time for oxygen release
  2. the volume of hydrogen peroxide solution
  3. the volume of the test tubes
  4. the mass of the liver and potato tissues

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