Yoghurt is produced when bacteria convert milk sugar into lactic acid. This process is called
Correct answer: C. fermentation
- A. photosynthesis
- B. aerobic respiration
- C. fermentation
- D. nitrogen fixation
Explanation
The bacteria ferment lactose anaerobically, and the acid they produce thickens the milk proteins. The same principle preserves many foods, from pickles to cheese.
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Biotechnology applies genetic engineering, cell culture and recombinant DNA methods to medicine and public health. The material includes production of insulin, vaccines and antibiotics, diagnostic techniques, gene therapy, genetically modified organisms and the ethical concerns surrounding manipulation of human genes.
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