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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Senior Manager
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Neuroscientists are making progress in discovering more [#permalink]

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29 Jul 2004, 13:36
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8. 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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29 Jul 2004, 19:57

B - completely out of scope
C - contradicts the evidence itself. Hence out of shortlist
D - out of scope again
E - out of scope again
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29 Jul 2004, 23:27
whats the OA??....

why is E out of scope??
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29 Jul 2004, 23:28
I will go with D because if in some people the chemical that produces the protein deposits or whatever is absent then no matter how old those people grow they will never develop this disease.
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30 Jul 2004, 00:01
Karthik,
E is out of scope because it is giving a specific information about people in their forties. The CR is essentially on people who are old and how the protein deposits have been found in them - yada yada yada. So E does not have any direct relevance.
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30 Jul 2004, 00:36

The author states that:
the older you grow => the more protein deposits you have => the greater the risk of the desease

However, D breaks this chain by showing that big protein deposits can sometimes fail to result in the desease. So, the claim that EVERYONE will some day develop the desease is thus invalidated
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30 Jul 2004, 00:40
Same explanation as Oleg's. (D) is best.
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30 Jul 2004, 06:58
I believe (D) is best. This brings in a case where the people who lack a certain chemical will never develop the decease even if they get old enough
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30 Jul 2004, 07:04
D is the best. same reasoning as OlegC's
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30 Jul 2004, 07:11
Trying to understand here - about the popular choice D

The statement says 'Similar deposits are also found in the brains of elderly patients who do not suffer from Alzheimerâ€™s disease'.

D states 'Autopsies have shown that some people lack the chemical necessary for protein deposits to cause brain lesions'.

How does D explain those who have deposits but no Alzheimers.

Look at 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'.

Frankly my brain is not working well tonight and I can be wrong. I am eager to understand the explanation given in the OA. OA Pls.
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30 Jul 2004, 15:43
Great explanation guys. Thank you.

30 Jul 2004, 15:43
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