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In laboratory rats, a low dose of aspirin usually suffices t
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26 Jul 2013, 07:57
2
6
00:00
A
B
C
D
E
Difficulty:
5% (low)
Question Stats:
80% (00:39) correct 20% (00:41) wrong based on 609 sessions
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In laboratory rats, a low dose of aspirin usually suffices to block production of thromboxane, which is a substance that promotes blood clotting, but not seriously interfering with the production of prostacyclin, which prevents clotting.
(A) which is a substance that promotes blood clotting, but not seriously interfering (B) a substance that promotes blood clotting, but not seriously interfering (C) a substance that promotes blood clotting, but does not seriously interfere (D) which is a substance to promote blood clotting, but does not seriously interfere (E) which is a substance that promotes blood clotting, but not a serious interference
Re: In laboratory rats, a low dose of aspirin usually suffices t
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26 Jul 2013, 08:26
fozzzy wrote:
Can someone explain C and D
In laboratory rats, a low dose of aspirin usually suffices to block production of thromboxane, which is a substance that promotes blood clotting, but not seriously interfering with the production of prostacyclin, which prevents clotting.
(C) a substance that promotes blood clotting, but does not seriously interfere (D) which is a substance to promote blood clotting, but does not seriously interfere "A substance to promote" is not idiomatic first of all; then we can see that C has a parallel structure
substance that promotes (verb), but does not interfere (verb)
On the other hand D has
substance to promote (to + verb), but does not interfere (verb)
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Re: In laboratory rats, a low dose of aspirin usually suffices t
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26 Jul 2013, 08:40
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(D) which is a substance to promote blood clotting, but does not seriously interfere - the problem with option D is "To promote". Take a look at other forms of option D. which is a substance that promotes blood clotting, but does not seriously interfere - This is grammatically correct but unnecessarily length in comparison to option C which is a substance promoting blood clotting, but does not seriously interfere - This is grammatically correct
Hope it helps.
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Re: In laboratory rats, a low dose of aspirin usually suffices t
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26 Jul 2013, 08:41
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fozzzy wrote:
Just curious is a Noun + noun modifier preferred over a which clause?
It's hard to say, and the each case would be evaluated on its own, but
thromboxane, I)which is a substance that (...) II)a substance that (...)
(if everything else in the sentence is correct) the second case is better then the first one, just because it's more concise: you do not need "which" to refer back to "thromboxane" , you can just use an appositive modifier.
Hope it helps
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26 Jul 2013, 08:44
IMO C Here which is a non-essential modifier, but the statement emphasizes on thromboxane so; A,D,E are out. C makes more sense than B (interfere with Vs interfering with)
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26 Jul 2013, 12:45
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fozzzy wrote:
In laboratory rats, a low dose of aspirin usually suffices to block production of thromboxane, which is a substance that promotes blood clotting, but not seriously interfering with the production of prostacyclin, which prevents clotting.
(A) which is a substance that promotes blood clotting, but not seriously interfering (B) a substance that promotes blood clotting, but not seriously interfering (C) a substance that promotes blood clotting, but does not seriously interfere (D) which is a substance to promote blood clotting, but does not seriously interfere (E) which is a substance that promotes blood clotting, but not a serious interference
Nice question. The power split on this problem is parallelism, but I haven't seen much discussion about it because it's a bit hard to see.
You have to pay attention to the core of the sentence to find the parallelism: "A low dose of aspirin usually suffices to block production of thromboxane but not seriously interfering with the production of prostacyclin." By taking out the modifiers we can see the parallelism and more easily notice the error - "suffices 'to block' ... but not 'interfering'." We can see that we need the infinitive form of interfere (remembering that the GMAT allows us to drop the leading 'to') to be parallel. A, B, and E have incorrect forms of "interfere" and get eliminated. That leaves C and D, but D gets eliminated because it's less concise and it's unclear (D really should be written "which is a substance used to promote...").
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26 Jul 2013, 12:54
kalrac wrote:
IMO C Here which is a non-essential modifier, but the statement emphasizes on thromboxane so; A,D,E are out. C makes more sense than B (interfere with Vs interfering with)
Couple points of clarification here.
The sentence is about aspirin and we DO want non-essential modifiers after thromboxane and prostacyclin. 'Which' modifiers create non-essential clauses but so do appositives set off by commas. "A substance that promotes blood clotting" is a non-essential appositive and correct in the sentence.
That said, the "which" modifiers aren't great. Since we have a "which" modifier at the end of the sentence, it can be a bit confusing to the reader to have multiple "which" clauses in the sentence unless they have the same structure.
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80% (00:39) correct 
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