Biologists believe that they have found one of the : GMAT Sentence Correction (SC)
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Biologists believe that they have found one of the

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Biologists believe that they have found one of the [#permalink]

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11 Nov 2005, 06:40
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Biologists believe that they have found one of the substances that tell individual genes both when to become active and when to remain quiescent in the earliest phases of an embryoâ€™s development.

(A) tell individual genes both when to become active and when to remain
(B) tell individual genes both at which time they should become active or should remain
(C) tells individual genes both when to become active or remain
(D) tells individual genes both when to become active or when to remain
(E) will tell an individual gene both about when it should become active and remain
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11 Nov 2005, 06:51
rahulraao wrote:
Biologists believe that they have found one of the substances that tell individual genes both when to become active and when to remain quiescent in the earliest phases of an embryoâ€™s development.

(A) tell individual genes both when to become active and when to remain
(B) tell individual genes both at which time they should become active or should remain
(C) tells individual genes both when to become active or remain
(D) tells individual genes both when to become active or when to remain
(E) will tell an individual gene both about when it should become active and remain

I vote for C. Since the subject is "one of the substances", it's a singular form. So A and B are out because of "tell". E is out because "will tell". So down to C and D. D sounds too redundance by using "when" on both. I consider the setence as "become (active or remain)", so I chose C.
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11 Nov 2005, 07:25
aiming wrote:
rahulraao wrote:
Biologists believe that they have found one of the substances that tell individual genes both when to become active and when to remain quiescent in the earliest phases of an embryoâ€™s development.

(A) tell individual genes both when to become active and when to remain
(B) tell individual genes both at which time they should become active or should remain
(C) tells individual genes both when to become active or remain
(D) tells individual genes both when to become active or when to remain
(E) will tell an individual gene both about when it should become active and remain

I vote for C. Since the subject is "one of the substances", it's a singular form. So A and B are out because of "tell". E is out because "will tell". So down to C and D. D sounds too redundance by using "when" on both. I consider the setence as "become (active or remain)", so I chose C.

"one" is a quantifier that refers to only one thing. so usually "one" is followed by a singular verb, but in this case "one" is followed by a restrictive clause "that..." and the clause refers to the nearest noun that preceeds it. thats why "that" refers to "substances" and the verb that follows "that" must be plural. its A).
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11 Nov 2005, 08:20
A for me.
I think the sentence should be taken as
one of the (substances that tell..)
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11 Nov 2005, 08:58
Another one for A. C & D should be eliminated because substances is plural so "tell" is the correct verb. A is the best answer because of parallelism (both when to become active and when to remain)
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11 Nov 2005, 12:19
Forget about singular and plural. B, C and D are wrong because the correct idiom is both X and Y. E is not parallel at all. A remain
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11 Nov 2005, 13:11
I would also choose A because of parallelism: both when... and when
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11 Nov 2005, 16:40
christoph wrote:
aiming wrote:
rahulraao wrote:
Biologists believe that they have found one of the substances that tell individual genes both when to become active and when to remain quiescent in the earliest phases of an embryoâ€™s development.

"one" is a quantifier that refers to only one thing. so usually "one" is followed by a singular verb, but in this case "one" is followed by a restrictive clause "that..." and the clause refers to the nearest noun that preceeds it. thats why "that" refers to "substances" and the verb that follows "that" must be plural. its A).

Good explanation Chris! OA is A!
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15 Nov 2005, 03:33
I vote for A.
Reasons:
1. llism. ...when .... and when...
2. .....one of the substances that tell individual genes....
15 Nov 2005, 03:33
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