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O-LevelBiologyEcology & Environment5090/11 · May/June 2010 · Q271 Mark

During the production of yoghurt and cheese, the pH of the mixture changes. What causes this change in pH?

Abreakdown of lactose sugar

Bcoagulation of milk proteins

Cproduction of ethanol

Duptake of oxygen

✓ Correct answer

A: breakdown of lactose sugar

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About this question

Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2010 Paper 1 Variant 1, question 27.

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