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    #1

    which new note strengthen the reading?

    Hi, I cannot understand the right answer of the following question from the reading, from "Big Book". Would you please explain it to me. Bless you.

    Reading:
    The whole biosphere, like the individual organisms that live inside it, exists in a chemically dynamic state. In this homeostatic system, a great number of organic compounds are synthesized, transformed, and decomposed continuously; together, these processes constitute the major parts of the carbon cycle. For the smooth operation of this cycle, degradation is just as important as synthesis: the green plants produce great quantities of polymers, such as cellulose, and innumerable other compounds like alkaloids, terpenes, and flavonoids, that green plants cannot use as sources of energy during respiration. The release of the carbon in these compounds for recycling depends almost entirely on the action of both aerobic and anaerobic bacteria and certain types of fungi. Some bacteria and fungi possess the unique and extremely important biochemical asset of being able to catalyze the oxidation of numerous inert products, thereby initiating reaction sequences that produce carbon dioxide and so return much carbon to a form that actively enters into life cycles once again.

    Question:
    27. The author‟s contention about the importance of bacteria and fungi in the production of energy for life processes would be most clearly strengthened if which of the following were found to be true?
    (A) Both aerobes and anaerobes provide sources of energy through the decomposition of organic material.
    (B) Most compounds containing carbon are unavailable as energy sources except to some bacteria and fungi.
    (C) Bacteria and fungi break down inert material in ways that do not involve oxidation.
    (D) Many compounds remain inert, even in the presence of bacteria and fungi.
    (E) Bacteria and fungi assist in the synthesis of many organic compounds.


    Answer:
    I think that E is correct, although A seems true too. But the author of the book said that the correct answer is B!

    B discuss most compounds which are energy sources to some bacteria and fungi. Using most compounds as energy sources is not a thing that can strengthen the role of them to production of energy for others, because bacteria and fungi use them not nourish them to others.

    A is correct but is a repetition of the main concept of the reading and does not strengthen it.

    E is a note that means bacteria and fungi attend in the synthesis of many organic compounds, in addition to the previous role of the, as the only things that release the carbon in some compounds, which was discussed in the reading. So, this new note strengthen the role of bacteria and fungi.

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    #2

    Re: which new note strengthen the reading?

    Carbon is formed into complex polymers by green plants. This is "synthesis."

    Bacteria and fungi perform "degradation" - the breaking down of these polymers to release simple carbon. This is what is meant by "the production of energy for life processes."

    They do not both degrade and synthesize. If they synthesized, they would not be making carbon/energy available. The question is asking about the argument that they are needed for degradation - to provide carbon for other processes. So, it's not "E."

    Note the sentence: "The release of the carbon in these compounds for recycling depends almost entirely on the action of both aerobic and anaerobic bacteria and certain types of fungi."

    The argument would be even stronger if there were no "almost" there. If the dependence was total. That's "B."

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