Neuroscientists are making progress in discovering more : GMAT Critical Reasoning (CR)
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# Neuroscientists are making progress in discovering more

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Neuroscientists are making progress in discovering more [#permalink]

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15 Nov 2005, 15:49
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Neuroscientists are making progress in discovering more about the cause of Alzheimerâ€™s disease. Alzheimerâ€™s disease patients suffer from dementia and sever memory loss. Autopsies performed on such patients have revealed the presence of brain lesions caused by abnormal protein deposits. Similar deposits are also found in the brains of elderly patients who do not suffer from Alzheimerâ€™s disease. It follows that everyone who lives long enough will eventually develop Alzheimerâ€™s disease.

Which one of the following statements, if true, most seriously undermines the conclusion that everyone who lives long enough will eventually develop Alzheimerâ€™s disease?

(A) The lesions found in the brains of non-Alzheimerâ€™s disease patients are far less extensive than those found in the brains of Alzheimerâ€™s disease patients.
(B) The developing brain produces a greater number of cells than it will ever use. The extra cells are later destroyed by what biologists call â€œprogrammed cell death.â€
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Re: CR - Alzheimerâ€™s disease [#permalink]

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16 Nov 2005, 19:55
Neuroscientists are making progress in discovering more about the cause of Alzheimerâ€™s disease. Alzheimerâ€™s disease patients suffer from dementia and sever memory loss. Autopsies performed on such patients have revealed the presence of brain lesions caused by abnormal protein deposits. Similar deposits are also found in the brains of elderly patients who do not suffer from Alzheimerâ€™s disease. It follows that everyone who lives long enough will eventually develop Alzheimerâ€™s disease.

Which one of the following statements, if true, most seriously undermines the conclusion that everyone who lives long enough will eventually develop Alzheimerâ€™s disease?

(A) The lesions found in the brains of non-Alzheimerâ€™s disease patients are far less extensive than those found in the brains of Alzheimerâ€™s disease patients.----> but what if those lesions keep developing as the non-A's disease patients get old enough? Promising but not really strongly undermines the conclusion.
(B) The developing brain produces a greater number of cells than it will ever use. The extra cells are later destroyed by what biologists call â€œprogrammed cell death.â€
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Re: CR - Alzheimerâ€™s disease [#permalink]

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16 Nov 2005, 20:46
Quote:
Neuroscientists are making progress................... It follows that everyone who lives long enough will eventually develop Alzheimerâ€™s disease.

Which one of the following statements, if true, most seriously undermines the conclusion that everyone who lives long enough will eventually develop Alzheimerâ€™s disease?

Quote:
(D) Autopsies have shown that some people lack the chemical necessary for protein deposits to cause brain lesions.

D looks correct.

conclusion: all people who live longer will develop the disease.
D: some people who live longer lack xxx require for yyy to do zzz. If zzz doesnot happen, people do not develop the disease.
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16 Nov 2005, 21:36
D for me as well
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16 Nov 2005, 21:37
D for me as well
16 Nov 2005, 21:37
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