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Researchers studying the spread of the Black Plague in

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Joined: 01 Apr 2012
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GMAT Date: 07-14-2012
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Researchers studying the spread of the Black Plague in [#permalink] New post 07 Jul 2012, 05:08
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  25% (medium)

Question Stats:

73% (02:30) correct 27% (01:56) wrong based on 74 sessions
Researchers studying the spread of the Black Plague in sixteenth-century England claim that certain people survived the epidemic because they carried a genetic mutation, known as Delta-32, that is known to prevent the bacteria that causes the Plague from overtaking the immune system. To support this hypothesis, the researchers tested the direct descendants of the residents of an English town where an unusually large proportion of people survived the Plague. More than half of these descendants tested positive for the mutation Delta-32, a figure nearly three times higher than that found in other locations.

The researchers' hypothesis is based on which of the following assumptions?

(A) Delta-32 does not prevent a carrier from contracting any disease other than the Plague.
(B) The Plague is not similar to other diseases caused by bacteria.
(C) Delta-32 did not exist in its current form until the sixteenth century.
(D) No one who tested positive for Delta-32 has ever contracted a disease caused by bacteria.
(E) The Plague does not cause genetic mutations such as Delta-32.
[Reveal] Spoiler: OA
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Re: Black Plague [#permalink] New post 07 Jul 2012, 05:21
The stimulus says Mutation caused immune to plague. As this is Assumption type question, we need to eliminate the possibility of the reversal of CAUSE and EFFECT.

So, only E addresses the issue. kudos if u like the post :-D
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Re: Black Plague [#permalink] New post 07 Jul 2012, 21:21
revanth4gmat wrote:
The stimulus says Mutation caused immune to plague. As this is Assumption type question, we need to eliminate the possibility of the reversal of CAUSE and EFFECT.

So, only E addresses the issue. kudos if u like the post :-D


While I agree with your logic, I do not agree with your assumption. This is what I think about it:

Premise : More than half of the people tested positive for Delta-32; a lot of people survived Plague
Conclusion : People survived because of Delta-32

Here the assumption should be: The immunity to Plague does not cause the mutation Delta-32 and not The Plague does not cause mutation.

Correct me if I am wrong.

I would really appreciate if some expert can reply on this.

Thanks
Re: Black Plague   [#permalink] 07 Jul 2012, 21:21
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