IB Biology HL 1.2.13 Electron transport chain Question Bank
Practise IB Biology HL 1.2.13 by applying electron transport chain 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
C1.2.13 (HL)—Electron transport chain question 1
[Maximum number: 7]
Explain the role of the electron transport chain in the generation of ATP by cell respiration.
a. electron transport chain performs chemiosmosis / chemiosmosis generates ATP;
b. receives energy/electrons from oxidation reactions/from Krebs cycle/glycolysis;
c. receives electrons from reduced NAD/NADH/reduced FAD/FADH;
d. energy released as electrons pass from carrier to carrier (in the chain);
e. release of energy (from electron flow) coupled to proton pumping;
f. protons pumped into intermembrane space;
g. creates proton gradient;
h. protons diffuse back/move down the concentration gradient (across membrane);
i. protons pass through ATP synthase;
j. protons return to the matrix;
k. flow of protons provides energy for generating ATP;
I. electrons transferred to oxygen at end of electron transport chain;
7 max
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