Damaged nerves in the spinal cord do not regenerate : GMAT Critical Reasoning (CR) - Page 2
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# Damaged nerves in the spinal cord do not regenerate

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17 Feb 2011, 11:35
What is the source ?

Posted from my mobile device
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17 Feb 2011, 12:16
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17 Feb 2011, 22:12
I have no idea why it is A. I would have imploded on this question.
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17 Feb 2011, 22:46
you not able to get the stimulus or no answer choice made sense? Whats the guess? In difficult CR evaluate A, D and E first.

marcusaurelius wrote:
I have no idea why it is A. I would have imploded on this question.
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18 Feb 2011, 10:15
I interpreted the steam as giving evidence that a specific nerve could be regenerated and then making a broad assertion that nerve cell regeneration would become standard. To weaken the argument you would have to weaken the connection between the specific evidence and general conclusion.
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18 Feb 2011, 17:05
I chose B. But I can see why A is the correct answer. B just sounds good but this answer choice has no tie to the conclusion.
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19 Feb 2011, 00:33
A and B, hesitating on my choice, eventually, I choose A.
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19 Feb 2011, 01:20
clearly A: the substance that prevent nerve growth is by product of that substance , so that substance have some other function too, so if new antibody deactivate that substance then there are chances that other body function will affect.
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20 Feb 2011, 10:36
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.
(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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-------Analyze why option A in SC wrong-------

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20 Feb 2011, 23:40
IMO A
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22 Feb 2011, 04:34
If it were the GMAT, i would have selected B and moved on. But thankfully its not!
Good question nevertheless.
What is the source?
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22 Feb 2011, 12:50
Spent 1:37 on this problem and only chose A because I marked out the other examples. I'll need to read the other comments to fully grasp what A. was saying.
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07 Mar 2011, 22:44
Couldn't grasp nor paraphrase the meaning of A either.
English's not my main language to a "by-product" was little hard to understand. And all the "of the" "of the" had me confused.
So now, if I understand correctly,
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.

= inhibiting regeneration of nerves is only one of the things the antibodies do.
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16 May 2011, 20:10
A is a clean shot here.Since, the argument does not have a reasoning gap a defender answer choice or a third party element has to be brought in.

A does exactly the same stating the functionality.
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16 May 2011, 22:43
standard procedure is being discussed here. if there are effects of the main product they may be undesirable . hence A is somewhat correct.
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16 May 2011, 23:05
Vote for A as well
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Re: Damaged nerves in the spinal cord do not regenerate [#permalink]

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21 Feb 2012, 13:58
I choose B, but Agree with A after reading the explanation. Tough question.
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Re: Damaged nerves in the spinal cord do not regenerate [#permalink]

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21 Feb 2012, 15:49
This was a tough question for me. I was hesitating between A and B and eventually chose B. I had a tough time understanding what A was trying to say (fairly unclear in my opinion). The way I interpreted B was that the antibodies would also potentially block the nerve growth stimulants. If the nerve growth stimulants are also being blocked than the nerves won't necessarily grow back and cast the most doubt on the conclusion that it will become a standard procedure.

Reading through the comments I understand why A is an acceptable option, but I would still have had significant trouble with this question.
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Re: Damaged nerves in the spinal cord do not regenerate [#permalink]

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21 Feb 2013, 11:59
So for this weaken Q ... I got A

(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 prescribed concluded solution, it could mess with other body function
(B) Certain nerve-growth stimulants have similar chemical structures to those of the antibodies against nerve-growth inhibitors. -- irrelevant
(C) Nerves in the brain are similar to nerves in the spinal cord in their inability to regenerate themselves naturally. -- irrelevant, no mention of brain in question
(D) Researchers have been able to stimulate the growth of nerves not located in the spinal cord by using only nerve-growth stimulants. -- does not weaken
(E) Deactivating the substances inhibiting nerve growth for an extended period would require a steady supply of antibodies. -- nothing in question that says steady supply would be a problem
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Re: Damaged nerves in the spinal cord do not regenerate [#permalink]

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21 Feb 2013, 12:59
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I chose B and got this question wrong.
However, after review I think the answer is straight A.

Premise 1: Damaged nerves do not regenerate themselves naturally.
Premise 2: The reason is the presence of nerve-growth inhibitors.
Premise 3: Antibodies that deactivate those inhibitors have been developed.
Conclusion: Nerve repair will be a standard medical procedure in the foreseeable future.

Assumption: nerve-growth inhibitors are main factors that prevent damaged nerves' regeneration.

To weaken this assumption, we have to demonstrate those inhibitors are not the main factors, in fact, they are just by-products of the main function in the human body of the substances inhibiting nerve growth. So does that make any sense to attack the by-products. Nope!.

B is incorrect. Please see the first sentence: "Damaged nerves in the spinal cord do not regenerate themselves naturally, nor even under the spur of nerve-growth stimulants". It clearly says nerve-growth stimulants do not help to regenerate damaged nerves.
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Re: Damaged nerves in the spinal cord do not regenerate   [#permalink] 21 Feb 2013, 12:59

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