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Researchers are finding that in many ways an individual

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Researchers are finding that in many ways an individual [#permalink]

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New post 27 Apr 2009, 00:54
Researchers are finding that in many ways an individual bacterium is more analogous to a component cell of a multicellular organism than it is to a free-living, autonomous organism. Anabaena, a freshwater bacteria is a case in point. Among photosynthetic bacteria, Anabaena is unusual: it is capable of both photosynthesis and nitrogen fixation. Within a single cell, these two biochemical processes are incompatible: oxygen produced during photosynthesis, inactivates the nitrogenase required for nitrogen fixation. In Anabaena communities, however, these processes can coexist. When fixed nitrogen compounds are abundant, Anabaena is strictly photosynthetic and its cells are all'alike. When nitrogen levels are low, however, specialized cells called heterocysts are produced which lack chlorophyll (necessary for photosynthesis) but which can fix nitrogen by converting nitrogen gas into a usable form. Submicroscopic channels develop which connect the heterocyst cells with the photosynthetic ones and which are used for transferring cellular products between the two kinds of Anabaena cells.

Q. The author uses the example of Anabaena to illustrate the
(A) uniqueness of bacteria among unicellular organisms
(B) inadequacy of an existing view of bacteria
(C) ability of unicellular organisms to engage in photosynthesis
(D) variability of a freshwater bacteria
(E) difficulty of investigating even the simplest unicellular organisms
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Re: Anabaena [#permalink]

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New post 27 Apr 2009, 07:45
Ans .A
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New post 28 Apr 2009, 02:04
With the statement in the passage "Among photosynthetic bacteria, Anabaena is unusual", A seems to be the best answer.
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Re: Anabaena [#permalink]

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New post 30 Apr 2009, 05:09
IMO A.

individual bacterium is more analogous to a component cell of a multicellular organism >> Anabaena (though unusual) shows same behavior. >> Uniqueness
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Re: Anabaena   [#permalink] 30 Apr 2009, 05:09
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