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# A certain cultivated herb is one of a group of closely

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Joined: 05 Jan 2008
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A certain cultivated herb is one of a group of closely [#permalink]

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16 Mar 2008, 08:32
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A certain cultivated herb is one of a group of closely related plants that thrive in soil with high concentrations of metals that are toxic to most other plants. Agronomists studying the herb have discovered that it produces large amounts of histidine, an amino acid that, in test-tube solutions, renders these metals chemically inert. Possibly, therefore, the herb’s high histidine production is what allows it to grow in metal-rich soils, a hypothesis
that would gain support if ______.
A. histidine is found in all parts of the plant—roots, stem, leaves, and flowers
B. the herb’s high level of histidine production is found to be associated with an unusually low level of production of other amino acids
C. others of the closely related group of plants are also found to produce histidine in large quantities
D. cultivation of the herb in soil with high concentrations of the metals will, over an extended period, make the soil suitable for plants to which the metals are toxic
E. the concentration of histidine in the growing herb declines as the plant approaches maturity

Folks, I think the OA is wrong, OA is E, but I am stronly in for D. what do you think?
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Joined: 14 Mar 2008
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16 Mar 2008, 10:03
I'm in for D too, and that's before I saw OA
Re: CR 30:5/30   [#permalink] 16 Mar 2008, 10:03
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