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  • ID:9406-6628

    (翻译)The establishment of L-glutamic acid fermentation provided a significant impetus to the development of microbial production of primary metabolites. Encouraged by the establishment of the L-glutamic acid fermentation, various research projects have been carried out in the attempt to isolate wild strains or derive genetic mutants producing various kinds of amino acids. As a result, almost all of the amino acids are now commercially produced by fermentation.

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  • ID:9406-6810

    Wide-ranging research on tooth decay has recently produced some surprising findings. one indicates that cheddar may actually inhibit the tooth-decay process. It seems to have decay-slowing effect on human teeth if it is eaten immediately after sugar. Why cheese should have such an effect is unknown. It is speculated that the food might interfere with the acid that decays teeth or with bacteria that produce the acid. If so, it would be the first common food found to have this useful property. The other suprprising research finding was that heavily sweetened cereals proved about equally potent in causing decay whether they contained eight percent sugar or almost eight times that much.


    1. According to the passage, how many of the test results were unexpected?

    A. One B. Two C. Three D. Eight

    2. According to the passage, what effect does cheddar cheese seem to have?

    A. It interferes with the function of teeth.

    B. It makes sugar taste sweeter.

    C. It decreases the rate at which teeth decay.

    D. It helps in the digestion of food.

    3. It can be inferred from the passage that the research on the relationship between cheese and tooth.

    A. has been discredited

    B. will be slowed considerably

    C. has been found to be conclusive

    D. will be continued

    4. Researchers discovered that sweetened cereals were.

    A. important nutritionally

    B. all surprisingly heavy in sugar

    C. more expensive than cheese

    D. all equally harmful to teeth

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  • ID:9406-6832
    Most basidiomycetes undergo asexual reproduction.( )

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  • ID:9406-6802

    The sequence of bases on the DNA molecule carries the genetic information. ( )

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  • ID:9406-6638

    (翻译)很显然,要通过这些途径增加并引导代谢物质流向,在必要时,就必须除去这些限制。

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  • ID:9406-6637

    (翻译) For a virus to multiply. It must first infect a cell. At the onset of infection, the virus introduces into the cell its genetic material—RNA or DNA—accompanied in many instances by essential proteins. They replicate inside specific host cells by using the biosynthetic systems of the host under the direction of the viral genomes. Bacterial viruses which infect fermentation process microbial strains have caused serious problems particularly in the cheese starter culture and the glutamic acid fermentation.

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