i) Discuss the differences between the growth of bacteria in nature and that in artificial culture.
ii) Explain why salt and sugar have been used to preserve food.
Biology question
2010-05-30 1:11 am
回答 (1)
2010-05-30 4:26 am
✔ 最佳答案
1)In nature bacteria have to compete difference conditions such as sources of food , temperature , water , any presence of growth inhibitor ,......etc . Until the bacteria have good growth conditions they would multiply to form next generations . But in culture , they grow & breed in good conditions .2)This is because sugar & salt can absorb water even through cells of plants & animals . Most bacteria cannot survive whithout water .
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