IB Biology HL 1.1.16 Feedback inhibition Question Bank
Practise IB Biology HL 1.1.16 by applying feedback inhibition concepts to exam-style questions.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- identify the relevant biological structure, process or evidence
- apply the correct biological mechanism to the question
- evaluate the result using data, adaptation or ecological reasoning
C1.1.16 (HL)—Feedback inhibition question 1
[Maximum number: 4]
Feedback mechanisms are used in living organisms both to promote and respond to change.
Explain the regulation of metabolic pathways by end-product inhibition.
a. final product in pathway acts as an inhibitor/blocks (reaction)/slows (reaction);
b. first/early/earlier enzyme (in pathway is inhibited);
c. non-competitive / binds at allosteric site / causes active site to change;
d. production of end-product reduced/paused when there is an excess;
e. isoleucine inhibits enzyme using threonine as substrate at start of pathway to isoleucine;
f. negative feedback / production restarts when end-product used up/concentration drops;
For mpe accept other examples of endproduct inhibition if verified. Please add a note in such cases.
Marking guidance:
[4 max]
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