CAIE A-Level Biology A2 12.2.10 Lactate and Ethanol Fermentation Questions
Explain lactate and ethanol fermentation using evidence from each question and mark scheme.
- Syllabus
- 2028–2030
- Course
- Biology 9700
- Level
- A2
Exam points
- Explain lactate and ethanol fermentation in anaerobic respiration.
CAIE A-Level Biology A2 12.2.10 Lactate and Ethanol Fermentation Questions question 1
[Maximum number: 3]
Oxygen is needed for aerobic respiration in cells.
In eukaryotic cells, the mitochondrion is the organelle used for aerobic respiration.
Up to 60\% of the ATP that is produced in cancer cells comes from lactate fermentation of glucose, even though oxygen is present.
Scientists are developing cancer treatments to inhibit the enzyme that catalyses the last step of lactate fermentation.
Explain how the inhibition of this enzyme reduces the production of ATP in cancer cells.
any three from:
1 lactate dehydrogenase ;
2 less / no, pyruvate → lactate ;
3 (so) less / no, NAD, regenerated / recycled ;
4 (so) less / no, triose phoshate / TP, → pyruvate ;
5 (so) less / no, ATP from substrate, linked / level, reactions / phosphorylation (in glycolysis) ;
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