IB Biology Exam Prep

Category - Biology

A student is doing an experiment to determine how change in acidity affects enzyme activity. The time it takes for a disk soaked with catalase at different acidities to rise to the top of a vial containing 1% hydrogen peroxide will be measured. If the student presents the findings in a line graph, which of the following conditions will be represented on the x-axis of the graph?
  1. pH values
  2. Catalase concentrations.
  3. Disk rise times.
  4. Percent hydrogen peroxide.
Explanation
Correct Response: A. In this experiment, the change in acidity (the variable that will be manipulated) is the independent variable. In line graphs, the independent variable values are on the x-axis. Catalase concentration (B) and percent hydrogen peroxide (D) are constants in this experiment; they do not change. As such, they do not get plotted along either axis on a line graph. The disk rise times (C) are the dependent variable. Changes in the rise time depend on changes in the independent variable, such as acidity in this experiment. In a line graph, the dependent variable is plotted on the y-axis.
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