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Biologists believe that they have found one of the

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Director
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Biologists believe that they have found one of the [#permalink] New post 17 May 2005, 19:16
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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 embryo’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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Re: SC: One of the [#permalink] New post 17 May 2005, 19:32
Clear A. two important clues here:

i) the correct idiom is both ....... and .........
ii) that refers to substances which is plural therefore we need plural verb, tell.
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 [#permalink] New post 17 May 2005, 19:47
Initially even I thougt 'D'
but rejected because of 'OR'
and if "that " refers o sunstances , 'A' is correct
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 [#permalink] New post 17 May 2005, 20:17
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Re: SC: One of the [#permalink] New post 20 May 2005, 14:02
Vithal 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 embryo’s development.
(A) tell individual genes both when to become active and when to remain

(D) tells individual genes both when to become active or when to remain


I agree (A) is correct, but let me point out something interesting here. You might notice that "one" is singular, and usually is followed by a singular verb -- even if followed by a prepositional phrase containing a plural noun. e.g.:
One of the men tells me that it is time to go.
(D) looks tempting, if you noticed that.

But in this case, the sentence expresses a different thought, and "that tell individual genes" modifies the word substances, not the word one, and so calls for the plural noun. Hence (A) is correct.

A second point it that a GMAT question generally (I think) would not hinge on just ONE subtle point like that, and so the wrong choice (C) throws in a worse error, with both...or instead of both...and, to give you a second clue.
Re: SC: One of the   [#permalink] 20 May 2005, 14:02
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