CAIE A-Level Biology A2 12.2.11 Energy Yield Questions
Explain the energy yield of aerobic and anaerobic respiration using evidence from each question and mark scheme.
- Syllabus
- 2028–2030
- Course
- Biology 9700
- Level
- A2
Exam points
- Explain the energy yield of aerobic and anaerobic respiration.
CAIE A-Level Biology A2 12.2.11 Energy Yield Questions question 1
[Maximum number: 5]
Sometimes the muscle cells of an athlete need to carry out respiration in anaerobic conditions.
Explain why the respiration of glucose in anaerobic conditions produces less ATP than in aerobic conditions.
any five from:
1 only, glycolysis / conversion of glucose into pyruvate, occurs ;
2 (only) produces 2 molecules of ATP (net per molecule of glucose) ;
3 (only) substrate-linked phosphorylation (occurs) ;
4 pyruvate converted to lactate ;
5 lactate is energy-rich / AW ;
6 oxygen not available as final electron acceptor ;
7 electron transport chain / chemiosmosis / oxidative phosphorylation, does not occur ;
8 most ATP is produced (in aerobic conditions) in, electron transport chain / chemiosmosis / oxidative phosphorylation ;
9 no additional substrate-linked phosphorylation from Krebs cycle ;
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