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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]  18 Mar 2009, 23:45
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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.
[Reveal] Spoiler: OA

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Re: CR-Damaged nerves [#permalink]  19 Mar 2009, 01:11
B is the best
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Re: CR-Damaged nerves [#permalink]  19 Mar 2009, 04:07
For me also B
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Re: CR-Damaged nerves [#permalink]  21 Mar 2009, 22:30
Any takers?

OA not B
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Re: CR-Damaged nerves [#permalink]  21 Mar 2009, 22:49
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I think it should be A, because
conclusion: Nerve repair would be a standard procedure
OptionA: 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.
This implies that there are many fiunctions of this substance apart from inhibitiion....So every time there is a procedure doctors should take care that other functions should not get affected and hence doctors cannot do the same thing for every patient evrytime. It will depend from patient to patient.
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Re: CR-Damaged nerves [#permalink]  26 Mar 2009, 14:52
Nitya, Can you confirm what is the answer? I feel A.
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Re: CR-Damaged nerves [#permalink]  26 Mar 2009, 23:28
Agree with A.
nitya34 wrote:
6. 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. so, its other main effects might not allow the procedure to become standard.
(B) Certain nerve-growth stimulants have similar chemical structures to those of the antibodies against nerve-growth inhibitors. doesn't affect the conclusion
(C) Nerves in the brain are similar to nerves in the spinal cord in their inability to regenerate themselves naturally. irrelevant
(D) Researchers have been able to stimulate the growth of nerves not located in the spinal cord by using only nerve-growth stimulants. thanks for letting us know, but no
(E) Deactivating the substances inhibiting nerve growth for an extended period would require a steady supply of antibodies. this may or may not inhibit the procedure become standard
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Re: CR-Damaged nerves [#permalink]  27 Mar 2009, 05:26
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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.

IMO A.

A says that new discovery is wrong. Hence no surety on probable effects.
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Re: CR-Damaged nerves [#permalink]  29 Mar 2009, 09:51
hard to choose between A and B ..
OA Pls ??
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Re: CR-Damaged nerves [#permalink]  29 Mar 2009, 10:00
OA-A
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Re: CR-Damaged nerves [#permalink]  12 Feb 2010, 06:42
A I believe.
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Re: CR-Damaged nerves [#permalink]  12 Feb 2010, 19:32
IMO A
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Re: CR-Damaged nerves [#permalink]  14 Feb 2010, 03:59
I chose B but after seeing the OA and the explanations A has to be the best answer
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Re: CR-Damaged nerves [#permalink]  15 Feb 2010, 20:53
A is correct.

(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. --The antibodies that deactivate the inhibitors only solve half the problem here.
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Re: CR-Damaged nerves [#permalink]  17 Feb 2011, 06:29
nitya34 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.=> the argument is concerning about the damaged nerves and the inhibitors, so this answer is irrelevant.
(B) Certain nerve-growth stimulants have similar chemical structures to those of the antibodies against nerve-growth inhibitors.=> If nerve-growth stimulants have similar structures to those of the antibodies, so we won't know whether these antibodies will succeed or not because those stimulants have failed.
(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.

Between A and B, I say B.
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Re: CR-Damaged nerves [#permalink]  17 Feb 2011, 06:35
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Re: CR-Damaged nerves [#permalink]  17 Feb 2011, 06:50
+1 A
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Re: CR-Damaged nerves [#permalink]  17 Feb 2011, 06:56
Definitely, A.

(B) Certain nerve-growth stimulants have similar chemical structures to those of the antibodies against nerve-growth inhibitors. Not valid. This means that growth stimulants are antibodies. I dont like the word "certain".
(C) Nerves in the brain are similar to nerves in the spinal cord in their inability to regenerate themselves naturally. - Not valid. We dont care about nerves in the brain, we are talking about nerves in the cord
(D) Researchers have been able to stimulate the growth of nerves not located in the spinal cord by using only nerve-growth stimulants. Not valid. It doesnt`t correct to talk about other locations - there could be another types of nerves.
(E) Deactivating the substances inhibiting nerve growth for an extended period would require a steady supply of antibodies. So what??? Ok, let it be... We are talking about possibility, but not time period. So, irrelevant.

Actually, B, a bit confusing. It looks like a correct variant. But it is not.
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Re: CR-Damaged nerves [#permalink]  17 Feb 2011, 07:11
agree with A, but it was not an easy question for me.
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Re: CR-Damaged nerves [#permalink]  17 Feb 2011, 11:13
it is A
Re: CR-Damaged nerves   [#permalink] 17 Feb 2011, 11:13

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