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When a normally functioning immune system attacks a non self molecule,

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When a normally functioning immune system attacks a non self molecule,  [#permalink]

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New post 06 Oct 2019, 21:32
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

84% (01:03) correct 16% (01:02) wrong based on 83 sessions

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Competition Mode Question



When a normally functioning immune system attacks a non self molecule, the system has the ability to "remember" the specifics of the foreign body, and upon subsequent encounters with the same species of molecules, it reacts accordingly.

A. it reacts
B. the foreign body reacts
C. the molecules react
D. the immune system reacts
E. the species react

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Re: When a normally functioning immune system attacks a non self molecule,  [#permalink]

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New post 06 Oct 2019, 22:30
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In option A, the possible antecedents of the pronoun it are immune system and non self molecule. The non-underlined avoided this ambiguities by restating the immune system as system and also restating non self molecule as foreign body.

Per the logical meaning of the sentence, it is the immune system that reacts, not the molecules, the foreign body or the species. So we can eliminate options B, C, and E.

Option D is the correct answer. It clearly restates the immune system in order to avoid pronoun ambiguity. And per the meaning, it is the immune system that is expected to react. The subject immune system and verb reacts agree in number appropriately.
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Re: When a normally functioning immune system attacks a non self molecule,  [#permalink]

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New post 06 Oct 2019, 23:29
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When a normally functioning immune system attacks a non self molecule, the system has the ability to "remember" the specifics of the foreign body, and upon subsequent encounters with the same species of molecules, it reacts accordingly.



In above sentence,it's not clear to what "it" is referring to...So it's incorrect

After going through the sentence using the meaning analysis....It refers to the immune system


D. the immune system reacts....correct


OA:D

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Re: When a normally functioning immune system attacks a non self molecule,  [#permalink]

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New post 07 Oct 2019, 07:32
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In the text as well as in A, the pronoun 'it' refers to the system without any doubt. There may be naïve attempts to justify that 'it' may antecede either the system or the non-self molecule or the foreign body or the species or any other singular noun available in the passage. But nope; The first right of the pronoun is to refer to the subject, failing which it may seek other nouns. We have a handsome subject in the form of 'system' and in such a copybook situation, why would the pronoun seek any other noun.

However, D defensively substitutes the pronoun and says that the immune system reacts accordingly. It leaves no doubt whatever. Both A and E are correct.

I would personally fancy A to D, even though I suspect that the OA may prefer D.

I don't think there is any logic in B, C, and E.
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Re: When a normally functioning immune system attacks a non self molecule,  [#permalink]

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New post 07 Oct 2019, 09:03
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IMO the correct answer is D

When a normally functioning immune system attacks a non self molecule, the system has the ability to "remember" the specifics of the foreign body, and upon subsequent encounters with the same species of molecules, it reacts accordingly.

A. it reacts - Pronoun ambiguity, "it" can refer back to any singular nouns presented earlier in the sentence. - INCORRECT
B. the foreign body reacts - Meaning issue - INCORRECT
C. the molecules react - Meaning issue - INCORRECT
D. the immune system reacts - Removes the pronoun issue & re-applied the noun to make proper sense - CORRECT
E. the species react - Meaning issue - INCORRECT
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Re: When a normally functioning immune system attacks a non self molecule,  [#permalink]

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New post 07 Oct 2019, 21:08
Bunuel wrote:

Competition Mode Question



When a normally functioning immune system attacks a non self molecule, the system has the ability to "remember" the specifics of the foreign body, and upon subsequent encounters with the same species of molecules, it reacts accordingly.

A. it reacts
B. the foreign body reacts
C. the molecules react
D. the immune system reacts
E. the species react


Official Explanation



Correct Answer: D

Choice a is an unclear sentence because it could refer to several antecedents, including foreign body, molecules, immune system, and species. The correct antecedent is immune system. Choice e also has an error in subject-verb agreement (species requires a singular verb reacts).
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Re: When a normally functioning immune system attacks a non self molecule,   [#permalink] 07 Oct 2019, 21:08
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