Healthy lungs produce a natural antibiotic that protects : GMAT Critical Reasoning (CR)
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# Healthy lungs produce a natural antibiotic that protects

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VP
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Healthy lungs produce a natural antibiotic that protects [#permalink]

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06 Feb 2005, 03:05
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Healthy lungs produce a natural antibiotic that protects them from infection by routinely killing harmful bacteria on airway surfaces. People with cystic fibrosis, however, are unable to fight off such bacteria, even though their lungs produce normal amounts of the antibiotic. The fluid on a0.irway surfaces in the lungs of people with cystic fibrosis has an abnormally high salt concentration; accordingly, scientists hypothesize that the high salt concentration is what makes the antibiotic ineffective.

Which of the following, if true, most strongly supports the scientistsâ€™ hypothesis?

A. When the salt concentration of the fluid on the airway surfaces of healthy people is raised artificially, the salt concentration soon returns to normal.

B. A sample of the antibiotic was capable of killing bacteria in an environment with an unusually low concentration of salt.

C. When lung tissue from people with cystic fibrosis is maintained in a solution with a normal salt concentration, the tissue can resist bacteria.

D. Many lung infections can be treated by applying synthetic antibiotics to the airway surfaces.

E. High salt concentrations have an antibiotic effect in many circumstances.
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VP
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06 Feb 2005, 03:06
Hello, I go with B or C.

could you explain it?

thanks
VP
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06 Feb 2005, 08:07
i think C make sense because it is cystic fibrosis, which has high slat concentration, disabled the tissue to resist the bacteria.
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06 Feb 2005, 09:42
It is C. B does not link bacteria resistance to the cystic fibrosis infected lung tissue. B leaves open the possibility that it is cystic fibrosis rather than the high salt concentration which voids the antibiotic effect.
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Paul

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06 Feb 2005, 10:28
I will go with C

A - We are not interested in people with low concentration of salt, so this can be eliminated
B - It is possible that healthy people produce higher concentration of salt than an unusally low concentration of salt, so this can be eliminated.
D - Out of context
E - We are not interested in any high salt concentrations - we are interested in high salt concentration in the airway, so this can be eliminated
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07 Feb 2005, 01:45
Between B & C, C is better choice.
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07 Feb 2005, 16:56
I believe (C) is the best.

The problem with (B) is that it just says that the antibiotic kills the bacteria in low salt concentration. Does this mean it cannot kill the bacteria in high concentrations?
It is as good as saying I can drive in USA. Does this mean I cannot drive in India?
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08 Feb 2005, 07:33
Thanks fellows

The OA is C
VP
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08 Feb 2005, 08:02
i dont understand the answer ? the tissue has a high concentartion of salt because of the cystic fibrosis and the solution has normal salt coocentration in it. together it is a very high concentration of salt. as a result the tissue shouldnt resist the bacteria, because the antibiotic is ineffective. what am i missing ???
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19 Dec 2008, 19:35
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Clearly B and C are the only contender choices there. One should always avoid extreme words in the choices, if you have some contenders in place. B has "unusually", which makes it unusually bad here
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01 Jan 2009, 03:21
josh_nsit wrote:
Clearly B and C are the only contender choices there. One should always avoid extreme words in the choices, if you have some contenders in place. B has "unusually", which makes it unusually bad here

i also think same...C
Re: CR0526--cystic fibrosis   [#permalink] 01 Jan 2009, 03:21
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