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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 13 Aug 2011, 10:13
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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 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.



Have no clue how can this be the answer?Many more queries to come. I am having big issues in strengthen and weaken type CRs. Surprisingly, assumption questions is going pretty OK. Most probably because i am using DENIAL test(pretty powerful method).
[Reveal] Spoiler: OA
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Re: GMAT CR Strengthen/Weaken [#permalink] New post 13 Aug 2011, 11:57
Not sure how it's A, I would have thought it's E since we have to weaken the conclusion.

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Re: GMAT CR Strengthen/Weaken [#permalink] New post 13 Aug 2011, 12:30
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Clearly, then, nerve repair will be a standard medical procedure in the foreseeable future is the prediction given. However A states that :
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 means that the main function may play vital role in the body and therefore prevent this from becoming standard medical practice. In regards to E, it is stated no where that antibiotics are in short supply so this does not weaken the conclusion.
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Re: GMAT CR Strengthen/Weaken [#permalink] New post 13 Aug 2011, 12:33
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Our conclusion in this paragraph is "nerve repair will be a standard medical procedure in the forseeable future". We can imagine two instances were this would not be the case:

1) "Nerve repair" does not work - and there is therefore no reason to conduct the procedure.
2) "Nerve repair" will damage the body to such a degree, that the procedure will never be conducted (because of its byproduct), regardless of whether or not it regenerates nerves in the spinal cord.

Answer (A): This states that the main purpose of this inhibitor isn't to prevent regeneration of nerves, but something else entirely. Thus, we can conjecture that the main purpose is far more important than its secondary purpose of preventing regenration. Therefore, by turning off the inhibitor, we are possibly/probably causing collateral damage to the body.

(B) This esentially states that using other nerve-growth stimulants may have the same effect as injecting the antibodies. However, the effect would be the same, and therefore does not weaken the argument.
(C) This potentially strengthens (but certainly doesn't weaken) the argument that nerve repair will be a standard medical procedure in the future, as we can conjecture that the procedure might be possible on nerves found in both the brain and the spinal cord.
(D) The paragraph clearly states that those methods do not work on the spinal cord because of that inhibitor. This doesn't add any new information.
(E) This just tells you that the procedure is time-consuming/expensive. It doesn't negate the conclusion that we will be performing this procedure. (For example, chemotherapy is both a long and expensive treatment, but is still used in combatting cancer because of its effectiveness)
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Re: GMAT CR Strengthen/Weaken [#permalink] New post 13 Aug 2011, 20:34
Thanks Guys i see it now..

Apart from this, i have issues with CR Strengthen/Weaken accuracy and timing..How do you guys suggest to tackle the same..are there any standard pointers you see while tackling questions of these type..Or you just go with the flow..

I have gone through the Powerscore CR and MGMAT CR books..But reading theory and applying it in Q&A is a different..
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GMAT CR Strengthen/Weaken(New Question) [#permalink] New post 13 Aug 2011, 20:41
Companies in the country of Kollontay can sell semiconductors in the country of Valdivia at a price that is below the cost to Valdivian companies of producing them. To help those Valdivian companies, the Valdivian legislature plans to set a minimum selling price in Valdivia for semiconductors manufactured in Kollontay that is ten percent greater than the average production costs for companies in Valdivia.

Which of the following, if true, most seriously threatens the success of the plan?

(A) The annual rate of inflation in Kollontay is expected to exceed ten percent within the next year.
(B) Valdivia is not th e only country where companies in Kollontay currently sell semiconductors.
(C) Some Valdivian companies that sell semiconductors have announced that they plan to decrease their price for semiconductors.
(D) The government of Kollontoy will also set a minimum price for selling semiconductors in that country.
(E) Emerging companies in countries other than Kollontay will still be able to sell semiconductors in Valdivia at a price below the cost to Valdivian companies to manufacture them.
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GMAT CR Strengthen/Weaken(New Question) [#permalink] New post 13 Aug 2011, 20:42
Companies in the country of Kollontay can sell semiconductors in the country of Valdivia at a price that is below the cost to Valdivian companies of producing them. To help those Valdivian companies, the Valdivian legislature plans to set a minimum selling price in Valdivia for semiconductors manufactured in Kollontay that is ten percent greater than the average production costs for companies in Valdivia.

Which of the following, if true, most seriously threatens the success of the plan?

(A) The annual rate of inflation in Kollontay is expected to exceed ten percent within the next year.
(B) Valdivia is not th e only country where companies in Kollontay currently sell semiconductors.
(C) Some Valdivian companies that sell semiconductors have announced that they plan to decrease their price for semiconductors.
(D) The government of Kollontoy will also set a minimum price for selling semiconductors in that country.
(E) Emerging companies in countries other than Kollontay will still be able to sell semiconductors in Valdivia at a price below the cost to Valdivian companies to manufacture them.

Correct Answer E
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Re: GMAT CR Strengthen/Weaken [#permalink] New post 14 Aug 2011, 03:12
Was stumped by this as well but I think I get it now. Kudos guys. Optimus you tried looking at RonPurewal's video for this type of question, helps a lot.
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Re: GMAT CR Strengthen/Weaken [#permalink] New post 14 Aug 2011, 03:53
Pedro..I have you know..But still find it difficult to operate on CRs.
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Re: Damaged nerves in the spinal cord do not regenerate [#permalink] New post 24 Nov 2013, 05:49
Tricky question. But I was able to make it to the correct answer.

Key thing here is to stick to the conclusion: Nerve repair will be a standard medical procedure in future.

Choice A exactly weakens the conclusion by saying that prevention of regeneration of nerves is a normal function in human body and hence nerve repair cannot be followed as a standard medical procedure.
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Re: Damaged nerves in the spinal cord do not regenerate   [#permalink] 24 Nov 2013, 05:49
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