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Give one example in each case of the usefulness of bacteria in (a) a natural environment,
(b) an industrial process.
(a) In a natural environment bacteria bring about decay. In this way they stop accumulation of dead material and make available necessary compounds such as nitrates.
(b) Bacteria are used in industrial processes to make certain kinds of food (e.g. cheese, yoghurt), to make single-cell protein, to purify sewage and in the manufacture of certain chemicals (eg lactic acid).
Why are salt and sugar used in the production of dried meat and dried fruits? Substances that maintain a highly hypertonic environment, such as sugar and salt, are used in the
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10
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