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Neuroscientists are making progress in discovering more

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Director
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Neuroscientists are making progress in discovering more [#permalink] New post 02 Jun 2006, 11:01
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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 Neuroscientists [#permalink] New post 02 Jun 2006, 17:25
Among C, D and E, go with D. the reasoning is based on the result that revealed by autopsis and D undermines that result.

C and E are also tempting but donot weaken the argument......
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 [#permalink] New post 02 Jun 2006, 17:48
I will go with D.
Director
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 [#permalink] New post 02 Jun 2006, 19:45
OA is D...

Something that proves that something else is also necessary for brain lesions than mere presence of protein deposits will be the answer. So D is the answer.
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 [#permalink] New post 02 Jun 2006, 20:38
mahesh004 wrote:
OA is D...

Something that proves that something else is also necessary for brain lesions than mere presence of protein deposits will be the answer. So D is the answer.


Got D as well.
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 [#permalink] New post 03 Jun 2006, 10:29
D .. it says not all patients with protein deposits will have brain lesions
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 [#permalink] New post 08 Jun 2006, 01:12
Will go with D.
The autopsy seriously undermines the finidings of the scientists that teh disease is becuase of protein deposits that cause brain lesions.
The autopsy reveals that some people lack the protein that forms the lesions hence lesions might form because of some other factor.
  [#permalink] 08 Jun 2006, 01:12
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