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AP Biology 3.2 Environmental Impacts on Enzyme Function

Practise AP Biology 3.2 questions by connecting enzyme structure with temperature, pH, substrate levels and inhibitor effects on biological reaction rates.

Syllabus
Effective Fall 2025
Course
AP Biology

Exam points

  • explain how temperature or pH changes alter enzyme structure and activity
  • predict reaction-rate changes from substrate or product concentration and temperature
  • distinguish competitive and noncompetitive inhibition from binding site and response
  • design controls and interpret graphs, uncertainty or dose-response data from enzyme experiments

Covered syllabus points

3.2.A—Explain how changes to the structure of an enzyme may affect its function3.2.B—Explain how the cellular environment affects enzyme activity

3.2 Environmental Impacts on Enzyme Function question 1

[Maximum number: 2]

Figure 1 shows the reactions of the metabolic pathway used to synthesize amino acid B from

amino acid A in cells.

Figure 1. Synthesis of amino acid B from amino acid A

Figure 1. Synthesis of amino acid B from amino acid A

Question (a)

(a)

Based on Figure 1, explain how the binding of amino acid A to enzyme 1 is regulated by

amino acid B.

[ 1 ]

Question (b)

(b)

Based on Figure 1, explain how a change in pH could affect enzyme 3 in such a way that

amino acid B cannot be produced.

[ 1 ]
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