Critical Reasoning

Some types of organisms originated through
endosymbiosis, the engulfing of one organism by
another so that a part of 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 within
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 one 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 chlorarachniophyte
holds all of the genetic material of some
other organism.

(C) Nucleomorphs originated when an organism
endosymbiotically engulfed a
chlorarachniophyte.

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

(E) Chlorarachniophytes emerged as the result of
two organisms having undergone
endosymbiosis.

OA TBA

E

(A) Only organisms of types that originated
through endosymbiosis contain
nucleomorphs. - Not supported by the argument. Its a strong statement to make.

(B) A nucleomorph within the chlorarachniophyte
holds all of the genetic material of some
other organism. - Again not supported. Argument says nucleomorph contains the plants DNA not all genetic info of the other organism.

(C) Nucleomorphs originated when an organism
endosymbiotically engulfed a
chlorarachniophyte.- origination of nucleomorphs is not mentioned.

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

(E) Chlorarachniophytes emerged as the result of
two organisms having undergone
endosymbiosis. - supported in the argument. Check the last line.

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.

IMO E


Whats the source ????
My reasoning same as above

OA is E. This is from the LSAT in 2000.

mals24 wrote:E

(A) Only organisms of types that originated
through endosymbiosis contain
nucleomorphs. - Not supported by the argument. Its a strong statement to make.

(B) A nucleomorph within the chlorarachniophyte
holds all of the genetic material of some
other organism. - Again not supported. Argument says nucleomorph contains the plants DNA not all genetic info of the other organism.

(C) Nucleomorphs originated when an organism
endosymbiotically engulfed a
chlorarachniophyte.- origination of nucleomorphs is not mentioned.

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

(E) Chlorarachniophytes emerged as the result of
two organisms having undergone
endosymbiosis. - supported in the argument. Check the last line.

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.

Cool. Too good - you folks are ...

Mals/Ronnie, can you tell me if u were able to read and answer this in under 2 mins or even say around 2.5 mins?

I was able to reach to 'E' but too a good 4 mins or more

This CR was so damn confusing

E seems to be the best choice here