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Damaged nerves in the spinal cord do not regenerate

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Damaged nerves in the spinal cord do not regenerate [#permalink] New post 11 Aug 2009, 18:43
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

20% (00:00) correct 80% (06:50) wrong based on 4 sessions
Damaged nerves in the spinal cord do not regenerate themselves naturally, nor even under the spur of nerve-growth stimulants. The reason, recently discovered, is the presence of nerve-growth inhibitors in the spinal cord. Antibodies that deactivate those inhibitors have now been developed. Clearly, then, nerve repair will be a standard medical procedure in the foreseeable future.
Which of the following, if true, casts the most serious doubt on the accuracy of the prediction above?

(A) Prevention of the regeneration of damaged nerves is merely a by-product of the main function in the human body of the substances inhibiting nerve growth.
(B) Certain nerve-growth stimulants have similar chemical structures to those of the antibodies against nerve-growth inhibitors.
(C) Nerves in the brain are similar to nerves in the spinal cord in their ability to regenerate themselves naturally.
(D) Researchers have been able to stimulate the growth of nerves not located in the spinal cord by using only nerve-growth stimulants.
(E) Deactivating the substances inhibiting nerve growth for an extended period would require a steady supply of antibodies.

[Reveal] Spoiler:
Chose E, OA is A. Explanations please!
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Re: ETS Paper test#42 CR#6 [#permalink] New post 11 Aug 2009, 19:05
This was a straight A
Conclusion is :Nerve repair will be a standard medical procedure in the foreseeable future.

A is undermining this conclusion , as prevention is just a by-product , there are other main-functions that are performed by substances inhibiting nerve growth
by giving antibiotics and by deactivating inhibitors there can be damage and patients may not agree, so this is undermining the conclusion

E is no where related - E says an extended supply of antibiotics is needed , that is fine and does not undermine the conclusion
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Re: ETS Paper test#42 CR#6 [#permalink] New post 14 Aug 2009, 17:30
tough one.. a is close, by POE... others ore out of scope...
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Re: ETS Paper test#42 CR#6 [#permalink] New post 14 Aug 2009, 19:34
A says that the the inhibition of growth is NOT the main function of the inhibitors, implying that these inhibitors have some other function that may be important to the human body. Thus, if such a function exists and is important, antibodies may actually harm the body so the practice will not be commonplace.

Best way to tackle this is POE as the language is difficult.
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Re: ETS Paper test#42 CR#6 [#permalink] New post 14 Aug 2009, 21:23
Thanks guys. When I was working on this one, I eliminated B, C & D. Between A & E, went with E for it implies that nerve repair might not become a standard medical procedure as it requires steady supplies of the antibodies which might be difficult to maintain.

I think, I considered it to be a better option than A. But now, I can see that A is clearly a far better option than E, and E is borderline INSUFFICIENT, if I may borrow the term from DS vocabulary.
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Re: ETS Paper test#42 CR#6 [#permalink] New post 19 Aug 2009, 08:36
Prevention of the regeneration of damaged nerves is only an additional product of the main function in the human body of the substances inhibiting nerve growth

Human body’S substances that inhibit nerve growth has two or more things.

1) Many important things i.e preventing disease
2) Prevention of the regeneration of damaged nerves (But this is a by-product-additional product)

If antibodies will eliminate these substantances that inhibit nevre growth then they will make a big mistake.


not tough question but A is a very tough answer.
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Re: ETS Paper test#42 CR#6 [#permalink] New post 19 Aug 2009, 08:48
ichha148 wrote:
This was a straight A
Conclusion is :Nerve repair will be a standard medical procedure in the foreseeable future.

A is undermining this conclusion , as prevention is just a by-product , there are other main-functions that are performed by substances inhibiting nerve growth
by giving antibiotics and by deactivating inhibitors there can be damage and patients may not agree, so this is undermining the conclusion

E is no where related - E says an extended supply of antibiotics is needed , that is fine and does not undermine the conclusion


Good Explanation...
Re: ETS Paper test#42 CR#6   [#permalink] 19 Aug 2009, 08:48
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