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Neuroscientists are making progress in discovering more

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Neuroscientists are making progress in discovering more [#permalink] New post 15 Nov 2005, 15:49
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Neuroscientists are making progress in discovering more about the cause of Alzheimer’s disease. Alzheimer’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 Alzheimer’s disease. It follows that everyone who lives long enough will eventually develop Alzheimer’s disease.

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

(A) The lesions found in the brains of non-Alzheimer’s disease patients are far less extensive than those found in the brains of Alzheimer’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 “programmed cell death.â€
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Re: CR - Alzheimer’s disease [#permalink] New post 16 Nov 2005, 19:55
Neuroscientists are making progress in discovering more about the cause of Alzheimer’s disease. Alzheimer’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 Alzheimer’s disease. It follows that everyone who lives long enough will eventually develop Alzheimer’s disease.

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

(A) The lesions found in the brains of non-Alzheimer’s disease patients are far less extensive than those found in the brains of Alzheimer’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 “programmed cell death.â€
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Re: CR - Alzheimer’s disease [#permalink] New post 16 Nov 2005, 20:46
Quote:
Neuroscientists are making progress................... It follows that everyone who lives long enough will eventually develop Alzheimer’s disease.

Which one of the following statements, if true, most seriously undermines the conclusion that everyone who lives long enough will eventually develop Alzheimer’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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 [#permalink] New post 16 Nov 2005, 21:36
D for me as well
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 [#permalink] New post 16 Nov 2005, 21:37
D for me as well
  [#permalink] 16 Nov 2005, 21:37
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