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  3. Many microorganisms survive such environmental stresses as heat, cold

Many microorganisms survive such environmental stresses as heat, cold

游客2024-01-11  53
问题         Many microorganisms survive such environmental stresses as heat, cold
    and desiccation not by rapid rates of mitosis, but by producing specialized cells
    designed to persist in a dormant state in hostile environments. Most fungi, for
    example, yield single-celled spores, which, through wind distribution, can
(5)  survive for long periods of time before germinating and sprouting fungal
    filaments of their own. Other types of bacteria produce a special type of spore
    called an endospore, capable of withstanding such extremes as boiling and
    freezing temperatures, and even ultraviolet radiation.
        Though research results remain tentative, several factors may protect
(10) endospores from environmental stress: they have a low water content, unusual
    proteins and a tough spore coat absent in mature bacterial cells. When garden
    fruits and vegetables, which may contain botulism endospores, are preserved by
    canning at boiling temperatures, we know that these spores survive the heat
    and sprout in the food, and as a result, the bacteria generate the botulism toxin
(15) that can lead to food poisoning—proof of their magnificent resilience.
选项 A、describe the limits of biologists’ understanding of the phenomenon of cellular dormancy
B、explain how certain organisms have adapted to withstand environmental adversity
C、contrast the survival techniques of two organisms which use dormancy to survive hostile environments
D、explain why endospores are so adept at surviving the traditional canning process
E、suggest which methods are effective for killing endospores at which are not
答案 B
解析
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