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microbe species---Not convinced with the answer!!

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microbe species---Not convinced with the answer!!  [#permalink]

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New post 08 Apr 2011, 05:46
1
4
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A
B
C
D
E

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67% (01:34) correct 33% (02:15) wrong based on 174 sessions

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I have doubt about the official answer though the answer is from reliable source and explained by Kaplan. Still I want to understand the logic behind it.
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Re: microbe species---Not convinced with the answer!!  [#permalink]

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New post 08 Apr 2011, 07:47
The last two sentence provide the main conclusion of the argument. Hence in answer choice look for assumptions based on them.
1.) Assumption does not help conclusion completely
2.) Out of scope or false
3.) Fits the conclusion in the last two sentences
4.) Even if true, does not help the conclusion
5.) False
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New post 08 Apr 2011, 09:19
IEsailor wrote:
The last two sentence provide the main conclusion of the argument. Hence in answer choice look for assumptions based on them.
1.) Assumption does not help conclusion completely
2.) Out of scope or false
3.) Fits the conclusion in the last two sentences
4.) Even if true, does not help the conclusion
5.) False

My doubt about C is that,Do a microbiologists needs to experiment it PERSONALLY to have the complete knowledge about any species of organism.Means can't some other microbiologist(s) do the research and publish the result to others to gain the knowledge?
Option E says "No microbiologists can have the complete knowledge of any species of organism unless that microbiologist can cultivate that species in isolation".
Why B is OOS or false. OOS is the easiest reason I have seen to avoid an option. No personal offence to you IEsailor.
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Re: microbe species---Not convinced with the answer!!  [#permalink]

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New post 08 Apr 2011, 11:16
vjsharma25 wrote:
My doubt about C is that,Do a microbiologists needs to experiment it PERSONALLY to have the complete knowledge about any species of organism.Means can't some other microbiologist(s) do the research and publish the result to others to gain the knowledge?
Option E says "No microbiologists can have the complete knowledge of any species of organism unless that microbiologist can cultivate that species in isolation".
Why B is OOS or false. OOS is the easiest reason I have seen to avoid an option. No personal offence to you IEsailor.

Looks like you've got a good point!

The author provides a great deal of evidence about how and why individual species of microbe can't be isolated. His conclusion, based on that evidence, is that microbiologists don't fully understand those microbes. The glaring hole in the argument is the assumption that biologists can only understand things that they isolate. This leads us to (C) as the closest answer.

(B) is the right answer to the wrong question type. The first two sentences of evidence can be pieced together to logically infer that (B) must be true. However, this is an Assumption question, not an Inference question. Assumptions are unstated facts that are necessary for the conclusion to follow from the evidence. If they are true, the author's conclusion is properly drawn, but if they are proven false then the author's conclusion is undermined despite his facts being otherwise correct. (B) must be true as a consequence of his data, and (B) does not tie into his conclusion at all; for these two reasons, we can rule it out.

However, you're correct that we've made an error. The proper assumption is that no microbiologist can understand a microbe unless some microbiologists can isolate the bug. Indeed, it doesn't have to be the same one doing the isolating and the understanding. We've made a typo, and if you'll shoot me a PM with the source of the problem and a page number or problem ID number, I'll make sure it get's added to the errata sheet ASAP!
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New post 08 Apr 2011, 12:06
KapTeacherEli wrote:
vjsharma25 wrote:
My doubt about C is that,Do a microbiologists needs to experiment it PERSONALLY to have the complete knowledge about any species of organism.Means can't some other microbiologist(s) do the research and publish the result to others to gain the knowledge?
Option E says "No microbiologists can have the complete knowledge of any species of organism unless that microbiologist can cultivate that species in isolation".
Why B is OOS or false. OOS is the easiest reason I have seen to avoid an option. No personal offence to you IEsailor.

Looks like you've got a good point!

The author provides a great deal of evidence about how and why individual species of microbe can't be isolated. His conclusion, based on that evidence, is that microbiologists don't fully understand those microbes. The glaring hole in the argument is the assumption that biologists can only understand things that they isolate. This leads us to (C) as the closest answer.

(B) is the right answer to the wrong question type. The first two sentences of evidence can be pieced together to logically infer that (B) must be true. However, this is an Assumption question, not an Inference question. Assumptions are unstated facts that are necessary for the conclusion to follow from the evidence. If they are true, the author's conclusion is properly drawn, but if they are proven false then the author's conclusion is undermined despite his facts being otherwise correct. (B) must be true as a consequence of his data, and (B) does not tie into his conclusion at all; for these two reasons, we can rule it out.

However, you're correct that we've made an error. The proper assumption is that no microbiologist can understand a microbe unless some microbiologists can isolate the bug. Indeed, it doesn't have to be the same one doing the isolating and the understanding. We've made a typo, and if you'll shoot me a PM with the source of the problem and a page number or problem ID number, I'll make sure it get's added to the errata sheet ASAP!

Though I have also opted C first,but because of the reason explained above I didn't choose it and went for option B. I think now its clear that B can't be the answer and C also has some problem with it :) But OA is C only.
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New post 08 Apr 2011, 14:06
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vj, thanks for the PM. I actually have to backtrack--this problem doesn't have a mistake. However, what we do have here is an illustration of why LSAT problems aren't necessarily the best practice for the GMAT!

One of the major subjects tested by the LSAT is the difference between a 'sufficient' assumption and a 'necessary' assumption. Here is an example:

If a house is far from the city and either small or poorly constructed, it will be cheap. Clearly, my house was inexpensive

Necessary assumption: my house is far from the city. This must be true for my logic to be sound: if my house is close to the city, then my premises don't connect to my final conclusion and my argument is nonsense. However that assumption isn't enough in and of itself! My house also needs to be either small or cheaply built for us to be certain.

Sufficient assumption: My house is far from the city and small. This doesn't have to be true--my house could be far from the city and poorly built. But if it is true, then that is sufficient to prove my conclusion accurate 100% of the time.

The GMAT rarely distinguishes between these two, but the LSAT often tests both ways--and what we have here is a question of the latter. The prompt asks us what "enables the conclusion to be properly drawn," or in other words, which answer choice guarantees that the evidence logically leads to the conclusion. If (C) is true, then the conclusion is true--so it's the unambiguous right answer.
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Re: microbe species---Not convinced with the answer!!  [#permalink]

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New post 22 Mar 2012, 17:19
i chose c too cause it easily was tied to the conclusion, which is the last sentence. negate that conclusion and the arguments falls apart.
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New post 22 Mar 2012, 18:21
C links isolation and complete knowledge
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New post 22 Mar 2012, 22:11
only C goes the best................!!!!
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New post 08 May 2012, 07:11
negate statment C and the conclusion will no longer stand...hence , C is the assumption
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Re: microbe species---Not convinced with the answer!!  [#permalink]

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New post 10 May 2012, 10:32
Cause and Effect

Which one makes fore sense:

1. It is currently impossible to cultivate any one such species in isolation. Therefore microbiologists lack complete knowledge of most microbe species.

2. Microbiologists lack complete knowledge of most microbe species thus it is currently impossible to cultivate any one such species in isolation.

I think 1. is better because claiming that microbiologists lack complete knowledge of most microbe species. is out of scope for the passage; while 2. is more in line with the passage.

C is a good explanation for 2.
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New post 23 May 2012, 12:59
Option C seems to be correct here which states the assumption.
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Re: microbe species---Not convinced with the answer!!  [#permalink]

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New post 15 Jul 2017, 22:33
Using POE, C is left even though test takers hardly comprehend the idea of "complete knowledge".
E is wrong because the passage states that it is impossible to cultivate any one of "almost species".
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Re: microbe species---Not convinced with the answer!!   [#permalink] 15 Jul 2017, 22:33
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