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Damaged Nerves

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Damaged Nerves [#permalink] New post 13 Sep 2008, 06:56
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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 inability 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.
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Re: Damaged Nerves [#permalink] New post 13 Sep 2008, 08:49
Nihit wrote:
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.

if it is merely a by product, probably it will help inhibit NGI and makes it a standard medical procedure


B. Certain nerve-growth stimulants have similar chemical structures to those of the antibodies against nerve-growth inhibitors.

NGS + Anit bodies -> more power

C. Nerves in the brain are similar to nerves in the spinal cord in their inability to regenerate themselves naturally.

Out of scope

D. Researchers have been able to stimulate the growth of nerves not located in the spinal cord by using only nerve-growth stimulants.

Out of scope. We cannot say that using antibodies will not make it a standard procedure

E. Deactivating the substances inhibiting nerve growth for an extended period would require a steady supply of antibodies.

If a steady supply is needed and if we dont know whether one can provide a steady supply of antibodies, it casts a doubt on whether it will become a standard procedure or not



E is my answer
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Re: Damaged Nerves [#permalink] New post 13 Sep 2008, 17:53
I think, I have seen this CR earlier but can't remember the OA.

The argument for (A) is- If preventing the regeneration of damaged nerves is only a by-product of the main function, then it might actually have some other functions (which may be important). If this is stopped using the antibodies, then it might affect the other functions and hence may not be used as a standard procedure in the future.

What is OA?
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Re: Damaged Nerves [#permalink] New post 14 Sep 2008, 01:20
OA is A
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Re: Damaged Nerves [#permalink] New post 14 Sep 2008, 02:09
yeah, i got this answer choice wrong by selecting E. That's because I didn't know the exact meaning of the word "by-product," So I had to look it up in the dictionary and only after learning the actual definition, it became much clearer to me why A is correct.

it sucks that i missed this answer choice simply because i didn't know the definition of 1 freakin word!! :(
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Re: Damaged Nerves [#permalink] New post 14 Sep 2008, 04:44
Nihit wrote:
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 inability 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.


IMO A)

If inhibition of growth is just by-product of main function of nerve growth inhibitors then producing antibodies risk the main function not been performed.
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Re: Damaged Nerves [#permalink] New post 14 Sep 2008, 18:31
Nihit wrote:
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 inability 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.


Yes this question is discussed several times and i believe here the option A Vs E is the confution.

Lets break this argument into premise and concl :

PR1 :Damaged nerves in the spinal cord do not regenerate themselves naturally, nor even under the spur of nerve-growth stimulants.

PR2:The reason, recently discovered, is the presence of nerve-growth inhibitors in the spinal cord.

PR3:Antibodies that deactivate those inhibitors have now been developed.

CONCL:Clearly, then, nerve repair will be a standard medical procedure in the foreseeable future.

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. -> PERFECT this attacks PR2.Its just that even if we use antibodies is it guaranteed that normal nerve growth is unaffected or any other major side effect hence Concl is doubtful .INORDER to strengthen this argument one has to answer WHATS the MAIN FUNC of the INHIBITORS???
only then it ca be forseeable future medical practice !!!


E. Deactivating the substances inhibiting nerve growth for an extended period would require a steady supply of antibodies -> IS ANYONE saying that antibodies are required to inhibit nerve growth for extended period !!!hence this is wrong even if its true concl does not get affected ...one has to assume that antibodies need to be supplied coninuously.The issue here is whether antibodies can help nerve growth ... how much supply reqd is not under discussion hence OOS
any suggestions welcome
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Re: Damaged Nerves   [#permalink] 14 Sep 2008, 18:31
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