Here is a good LSAT CR problem. Will post solution tomorrow. : GMAT Critical Reasoning (CR)
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# Here is a good LSAT CR problem. Will post solution tomorrow.

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Senior Manager
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Here is a good LSAT CR problem. Will post solution tomorrow. [#permalink]

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01 Mar 2007, 16:25
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Here is a good LSAT CR problem.
Will post solution tomorrow.
Enjoy!

Some types of organisms originated through endosymbiosis, the engufing of one organism by another so that the former becomes a functioning part of the latter. An unusual nucleomorph, a structure that contains DNA and resembles a cell nucleus, has been discovered witin a plant known as a chlorarachniophyte. Two versions of a particular gene have been found in the DNA of this nucleomorph, and one would expect to find only a single version of this gene if the nucleomorph were not the remains of an engulfed organism's nucleus.

Which of the following is most strongly supported by the information above?

A) Only organisms of types that originated through endosymbiosis contain nucleomorphs.

B) A nucleomorph within the chlorachniophyte hold all of the genetic material of some other organism.

C) Nucleomorphs originated when an organism endosymbiotically engufed a chlorachniophyte.

D) Two organisms will not undergo endosymbiosis unless at least one of them contains a nucleomorph.

E) Chlorachniophytes emerged as the result of two organisms having undergone endosymbiosis
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Manager
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01 Mar 2007, 18:07
I will go with C..

What is the OA?? I am curious.........

thanks!
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01 Mar 2007, 18:13
nitinneha wrote:
I will go with C..

What is the OA?? I am curious.........

thanks!

i will post the answer (tomorrow) after enough people have had the chance to try it..
Director
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Re: LSAT CR - endosymbiosis [#permalink]

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01 Mar 2007, 19:23
Here is a good LSAT CR problem.
Will post solution tomorrow.
Enjoy!

Some types of organisms originated through endosymbiosis, the engufing of one organism by another so that the former becomes a functioning part of the latter. An unusual nucleomorph, a structure that contains DNA and resembles a cell nucleus, has been discovered witin a plant known as a chlorarachniophyte. Two versions of a particular gene have been found in the DNA of this nucleomorph, and one would expect to find only a single version of this gene if the nucleomorph were not the remains of an engulfed organism's nucleus.

Which of the following is most strongly supported by the information above?

A) Only organisms of types that originated through endosymbiosis contain nucleomorphs.

If A then B.
B does not mean A.

If nucleomorph then endosymbiosis.
Endosymbiosis does not mean nucleomorph.

Hence A can't be the answer.

B) A nucleomorph within the chlorachniophyte hold all of the genetic material of some other organism.

Not supported by argument.

C) Nucleomorphs originated when an organism endosymbiotically engufed a chlorachniophyte.

Nucleomorph were the remains of an engulfed organism's nucleus. A chlorachniophyte has enguled some other organism. Not C.

D) Two organisms will not undergo endosymbiosis unless at least one of them contains a nucleomorph.

Need not be true according to argument.

E) Chlorachniophytes emerged as the result of two organisms having undergone endosymbiosis

Chlorachniophtes emerged after a plant has engufed something else. Hence E is my answer.

Nice question.
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01 Mar 2007, 20:56
I will go with E

2 versions of the dna were found when only one was expected therefore Chlorachniophytes emerged as a result of being engulged by the process of endosymbiosis
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02 Mar 2007, 03:47
another E. But to me it seems such an obvious E, I wonder if I am wrong..
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02 Mar 2007, 06:21
Correct anwer is E. nice job!
Ill put some really challenging LSAT problems together this weekend..
02 Mar 2007, 06:21
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