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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 10 Oct 2005, 08:41
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8. 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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 [#permalink] New post 10 Oct 2005, 09:28
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 [#permalink] New post 10 Oct 2005, 10:33
D for me too
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 [#permalink] New post 11 Oct 2005, 07:03
go D go...
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 [#permalink] New post 11 Oct 2005, 07:13
D points to a caveat in the author`s conclusion, thereby weakening it.

A is a close second, but it is possible that those elderly people that had the same protein deposits could have eventually developed Alzheimers Disease.
  [#permalink] 11 Oct 2005, 07:13
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