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Dream_GMAT · 06-04-2008, 07:53 PM

1It is not known whether bovine spongiform encephalopathy (BSE), a disease of cattle invariably deadly to them, can be transmitted directly from one infected animal to another at all stages of the infection. If it can be, there is now a reservoir of infected cattle incubating the disease. There are no diagnostic tests to identify infected animals before the animals show overt symptoms. Therefore, if such direct transmission occurs, the disease cannot be eradicated by______
Which one of the following best completes the argument?
(A) removing from the herd and destroying any diseased animal as soon as it shows the typical symptoms of advanced BSE
(B) developing a drug that kills the agent that cause BSE, and then treating with that drug all cattle that might have the disease
(C) destroying all cattle in areas where BSE occurs and raising cattle only in areas to which BSE is known not to have spread
(D) developing a vaccine that confers lifelong immunity against BSE and giving it to all cattle, destroying in due course all those animals for which the vaccine protection came too late
(E) developing a diagnostic test that does identify any infected animal and destroying all animals found to be infected

Impact craters caused by meteorites smashing into Earth have been found all around the globe, but they have been found in the greatest density in geologically stable regions. This relatively greater abundance of securely identified crater in geologically stable regions must be explained by the lower rates of destructive geophysical processes in those regions.
The conclusion is properly drawn if which one of the following is assumed?
(A) A meteorite that strikes exactly the same spot as an earlier meteorite will obliterate all traces of the earlier impact.
(B) Rates of destructive geophysical processes within any given region vary markedly throughout geological time.
(C) The rate at which the Earth is struck by meteorites has greatly increased in geologically recent times.
(D) Actual meteorite impacts have been scattered fairly evenly over the Earth’s surface in the course of Earth’s geological history.
(E) The Earth’s geologically stable regions have been studied more intensively by geologists than have its less stable regions.

Please explain your answer choices.

CACERJ01 · 06-05-2008, 06:30 AM

Hi Dream GMAT,

Here is my reasoning:

1. Which one of the following best completes the argument?
(A) OK. I think it is the best answer. The argument states that "there is now a reservoir of infected cattle incubating the disease" and, because of "there are no diagnostic tests to identify infected animals before the animals show over symptoms", the disease cannot be eradicated by removing and destroying any diseased animal as soon as it shows the typical symptoms of advanced BSE. There will be always an animal incubating the disease.
(B) The opposite. If they develop a drug that kills the agent that cause BSE and then treat with that drug all cattle, they would eradicate the disease. The question is about "not eradicate".
(C) Remains a doubt. If they destroy cattle in areas where BSE occurs and raise cattle only in areas to which BSE is not spread, it could be or could not be eradicated the disease.
(D) Out of scope. The intention to give immunity against BSE to all cattle is not focuss on eradicating the disease.
(E) The opposite. The argument states that "there are no diagnostic tests to identify infected animals before the animals show over symptoms". If they develop a diagnostic test, they could eradicate the disease. The question is about "not eradicate".

2. The conclusion is properly drawn if which one of the following is assumed?
(A) Out of scope. It is not related to the lower rates of destructive geophysical processes in geologically stable regions. The traces of a meteorite alone does not mean that there will be a securely identified crater.
(B) The opposite. If the rates of destructive geophysical processes within any given region vary markedly, it does not support the lower rates of destructive geophysical processes in geologically stable regions.
(C) OK. I think it is the best answer. If the rate at which the Earth is struck by meteorites has greatly increased, there will be a securely identified crater because of the lower rates of destructive geophysical processes in geologically stable regions.
(D) Too broad. The meteorite impacts over the Earth’s surface could be in any kind of region, not necessarily the geologically stable regions.
(E) Out of scope. The argument does not infere that the study of geologists influenced.

I tried to write the more clear that I can. Please, let me know if I am right or wrong.
I hope this helps you.

Cheers.

Dream_GMAT · 06-10-2008, 01:36 PM

The OAs - A and D.

CACERJ01 · 06-10-2008, 04:08 PM

Hi Dream GMAT,

Thanks for the OAs. I understand Q1 A but I do not get D as the right answer for Q2. Do you have the Official Explanation of the source?

Could anybody help me with the Q2?

Thanks in advance.

Cheers.

Dream_GMAT · 06-10-2008, 09:20 PM

Hi Cacerj01..the source is 1000 CR doc and there is no explanation provided...

May be i can help you here....hope my logic is fine..though i developed it after seeing the answer

D says- Actual meteorite impacts have been scattered fairly evenly over the Earth’s surface in the course of Earth’s geological history that means the meteorite level was equal everywhere

Conclusion - This relatively greater abundance of securely identified crater in geologically stable regions must be explained by the lower rates of destructive geophysical processes in those regions.

If we negate D we say the scatter was not eve...it may be more ( may be less too ...i dont know..) if more then the reason of high amount is not the lower rates of destructive geophysical processes in those regions.

Conclusion doesn't hold good.....

vinnie · 06-10-2008, 09:52 PM

the answer of the q2 stands as d .the reason is that meteorites struck in all parts of the earth equally and led to formation of the craters but with time the craters in the geologically weak area got eroded due to erosion and disappeared but in the geologically strong area this was not the case and that is the reason the crater still exists so from here we can make out that the assumption supports the conclusion

vinnie · 06-10-2008, 09:53 PM

[quote=vinnie;601204]the answer of the q2 stands as d .the reason is that meteorite struck in all parts of the earth equally and led to formation of the craters but with time the craters in the geologically weak area got eroded due to erosion and disappeared but in the geologically strong area this was not the case and that is the reason the crater still exists so from here we can make out that the assumption supports the conclusion so this answer c omes out good enough to me

CACERJ01 · 06-11-2008, 04:17 AM

Hi Dream GMAT, Hi Vinnie,

Thanks for your responses. Your logic convinced me. You are right

I think that on your point of view, Answer C is too specific and Answer D supported in a better way the conclusion of the passage.

Cheers.

06-04-2008, 07:53 PM	#1 (permalink)
Dream_GMAT Target 750 !!! Join Date: May 2008 Location: Bangalore Posts: 59	Curing BSE 1It is not known whether bovine spongiform encephalopathy (BSE), a disease of cattle invariably deadly to them, can be transmitted directly from one infected animal to another at all stages of the infection. If it can be, there is now a reservoir of infected cattle incubating the disease. There are no diagnostic tests to identify infected animals before the animals show overt symptoms. Therefore, if such direct transmission occurs, the disease cannot be eradicated by______ Which one of the following best completes the argument? (A) removing from the herd and destroying any diseased animal as soon as it shows the typical symptoms of advanced BSE (B) developing a drug that kills the agent that cause BSE, and then treating with that drug all cattle that might have the disease (C) destroying all cattle in areas where BSE occurs and raising cattle only in areas to which BSE is known not to have spread (D) developing a vaccine that confers lifelong immunity against BSE and giving it to all cattle, destroying in due course all those animals for which the vaccine protection came too late (E) developing a diagnostic test that does identify any infected animal and destroying all animals found to be infected Impact craters caused by meteorites smashing into Earth have been found all around the globe, but they have been found in the greatest density in geologically stable regions. This relatively greater abundance of securely identified crater in geologically stable regions must be explained by the lower rates of destructive geophysical processes in those regions. The conclusion is properly drawn if which one of the following is assumed? (A) A meteorite that strikes exactly the same spot as an earlier meteorite will obliterate all traces of the earlier impact. (B) Rates of destructive geophysical processes within any given region vary markedly throughout geological time. (C) The rate at which the Earth is struck by meteorites has greatly increased in geologically recent times. (D) Actual meteorite impacts have been scattered fairly evenly over the Earth’s surface in the course of Earth’s geological history. (E) The Earth’s geologically stable regions have been studied more intensively by geologists than have its less stable regions. Please explain your answer choices.

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06-05-2008, 06:30 AM	#2 (permalink)
CACERJ01 Within my grasp! Join Date: May 2007 Location: Lima, Peru Posts: 123	Hi Dream GMAT, Here is my reasoning: 1. Which one of the following best completes the argument? (A) OK. I think it is the best answer. The argument states that "there is now a reservoir of infected cattle incubating the disease" and, because of "there are no diagnostic tests to identify infected animals before the animals show over symptoms", the disease cannot be eradicated by removing and destroying any diseased animal as soon as it shows the typical symptoms of advanced BSE. There will be always an animal incubating the disease. (B) The opposite. If they develop a drug that kills the agent that cause BSE and then treat with that drug all cattle, they would eradicate the disease. The question is about "not eradicate". (C) Remains a doubt. If they destroy cattle in areas where BSE occurs and raise cattle only in areas to which BSE is not spread, it could be or could not be eradicated the disease. (D) Out of scope. The intention to give immunity against BSE to all cattle is not focuss on eradicating the disease. (E) The opposite. The argument states that "there are no diagnostic tests to identify infected animals before the animals show over symptoms". If they develop a diagnostic test, they could eradicate the disease. The question is about "not eradicate". 2. The conclusion is properly drawn if which one of the following is assumed? (A) Out of scope. It is not related to the lower rates of destructive geophysical processes in geologically stable regions. The traces of a meteorite alone does not mean that there will be a securely identified crater. (B) The opposite. If the rates of destructive geophysical processes within any given region vary markedly, it does not support the lower rates of destructive geophysical processes in geologically stable regions. (C) OK. I think it is the best answer. If the rate at which the Earth is struck by meteorites has greatly increased, there will be a securely identified crater because of the lower rates of destructive geophysical processes in geologically stable regions. (D) Too broad. The meteorite impacts over the Earth’s surface could be in any kind of region, not necessarily the geologically stable regions. (E) Out of scope. The argument does not infere that the study of geologists influenced. I tried to write the more clear that I can. Please, let me know if I am right or wrong. I hope this helps you. Cheers.

06-10-2008, 01:36 PM	#3 (permalink)
Dream_GMAT Target 750 !!! Join Date: May 2008 Location: Bangalore Posts: 59	The OAs - A and D.

06-10-2008, 04:08 PM	#4 (permalink)
CACERJ01 Within my grasp! Join Date: May 2007 Location: Lima, Peru Posts: 123	Hi Dream GMAT, Thanks for the OAs. I understand Q1 A but I do not get D as the right answer for Q2. Do you have the Official Explanation of the source? Could anybody help me with the Q2? Thanks in advance. Cheers.

06-10-2008, 09:20 PM	#5 (permalink)
Dream_GMAT Target 750 !!! Join Date: May 2008 Location: Bangalore Posts: 59	Hi Cacerj01..the source is 1000 CR doc and there is no explanation provided... May be i can help you here....hope my logic is fine..though i developed it after seeing the answer D says- Actual meteorite impacts have been scattered fairly evenly over the Earth’s surface in the course of Earth’s geological history that means the meteorite level was equal everywhere Conclusion - This relatively greater abundance of securely identified crater in geologically stable regions must be explained by the lower rates of destructive geophysical processes in those regions. If we negate D we say the scatter was not eve...it may be more ( may be less too ...i dont know..) if more then the reason of high amount is not the lower rates of destructive geophysical processes in those regions. Conclusion doesn't hold good.....

06-10-2008, 09:52 PM	#6 (permalink)
vinnie Eager! Join Date: Jun 2008 Posts: 87	the answer of the q2 stands as d .the reason is that meteorites struck in all parts of the earth equally and led to formation of the craters but with time the craters in the geologically weak area got eroded due to erosion and disappeared but in the geologically strong area this was not the case and that is the reason the crater still exists so from here we can make out that the assumption supports the conclusion

06-10-2008, 09:53 PM	#7 (permalink)
vinnie Eager! Join Date: Jun 2008 Posts: 87	[quote=vinnie;601204]the answer of the q2 stands as d .the reason is that meteorite struck in all parts of the earth equally and led to formation of the craters but with time the craters in the geologically weak area got eroded due to erosion and disappeared but in the geologically strong area this was not the case and that is the reason the crater still exists so from here we can make out that the assumption supports the conclusion so this answer c omes out good enough to me

06-11-2008, 04:17 AM	#8 (permalink)
CACERJ01 Within my grasp! Join Date: May 2007 Location: Lima, Peru Posts: 123	Hi Dream GMAT, Hi Vinnie, Thanks for your responses. Your logic convinced me. You are right I think that on your point of view, Answer C is too specific and Answer D supported in a better way the conclusion of the passage. Cheers.

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