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Which of the following most logically completes the

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Which of the following most logically completes the [#permalink] New post 27 Jun 2008, 15:46
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A
B
C
D
E

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Which of the following most logically completes the argument?
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
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Re: CR:histidine [#permalink] New post 27 Jun 2008, 16:35
IMO D.
Because histadine will make metal inert, so earth can be used for other plants as well.

But a close though should also be give to C.
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Re: CR:histidine [#permalink] New post 27 Jun 2008, 16:57
i will go with C...close enough was D..but what if over time..metals loose their affectivness because of other factors???
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Re: CR:histidine [#permalink] New post 27 Jun 2008, 17:16
Answer should be D

A. histidine is found in all parts of the plant—roots, stem, leaves, and flowers
Irrelevant...What matters is that the plant actually produces histidine. WHERE it is located does not matter. In fact, I'm pretty sure it can be argued that the histidines would be most concentrated at the roots (point of impact with toxic soil)

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
again, irrelevant

C. others of the closely related group of plants are also found to produce histidine in
large quantities
doesnt support the hypothesis. just because other related plants produce histidine as well doesn't guarantee that it is the histidine that allows the plants to thrive

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
perfect experiment to prove hypothesis. place plant in toxic soil. over a period of time the toxicity goes down and allows other plants to grow in the soil as well, most likely due to histidine production

E. the concentration of histidine in the growing herb declines as the plant approaches
maturity

irrelevant. its like saying the army of a nation shrinks as it's level of safety increases
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Last edited by GMATobliterator on 27 Jun 2008, 18:46, edited 1 time in total.
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Re: CR:histidine [#permalink] New post 27 Jun 2008, 18:17
rpmodi wrote:
Which of the following most logically completes the argument?
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


A is the best!
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Re: CR:histidine [#permalink] New post 27 Jun 2008, 18:43
sondenso wrote:

A is the best!


Why?
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Re: CR:histidine [#permalink] New post 28 Jun 2008, 12:44
I have not seen the correct answer yet .
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Re: CR:histidine [#permalink] New post 28 Jun 2008, 15:12
rpmodi wrote:
Which of the following most logically completes the argument?
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 ______.

E. the concentration of histidine in the growing herb declines as the plant approaches
maturity


E. argument says that 'the herb produces large amounts of histidine'...and that it must be 'the herb's high histidine production that allows it to grow..'

So, if it's growing, it'll continue to produce histidine, but as it reaches maturity it will not produce as much. therefore, should decline as it approaches maturity
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Re: CR:histidine [#permalink] New post 29 Jun 2008, 13:52
C for me as it mentions other plants in the premise and some relation needs to be showed with the premise in fully supported proof...what is the OA?
Re: CR:histidine   [#permalink] 29 Jun 2008, 13:52
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