O-LevelBiologyRespiration5090/12 · May/June 2019 · Q271 Mark

Waste products from microorganisms are used in the production of bread and yoghurt. Which waste products from microorganisms are used in these two processes? bread-making yoghurt production carbon dioxide carbon dioxide carbon dioxide lactic acid lactic acid carbon dioxide lactic acid lactic acid

Acarbon dioxide, carbon dioxide

Bcarbon dioxide, lactic acid

Clactic acid, carbon dioxide

Dlactic acid, lactic acid

✓ Correct answer

B: carbon dioxide, lactic acid

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Topic: Respiration, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2019 Paper 1 Variant 2, question 27.

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