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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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02 Jun 2008, 19:46
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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. Genes [#permalink]

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02 Jun 2008, 20:13
B, C and D can be eliminated since the usage of or with both is wrong - between A and D, A seems the most appropriate - what is the OA??
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Re: SC. Genes [#permalink]

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02 Jun 2008, 20:26
this is A..because here what we have is one of the substances THAT..the restrictive clause "that" refers to the closest noun to it and in this case its substances..so therefore we need "tell"..

A is also parallel..
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Re: SC. Genes [#permalink]

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03 Jun 2008, 12:27
wizardofwashington 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
(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

(Source: Original source unknown; secondary source Beat The GMAT forums)

"substances that....tell" for agreement. Eliminate C,D
B and E have issues where "it" and "they" can refer to either "subtances" or "genes"

A = winner
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Re: SC. Genes [#permalink]

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03 Jun 2008, 12:33
wizardofwashington 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
(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

(Source: Original source unknown; secondary source Beat The GMAT forums)

A here as it has the correct S-V agreement, idomatic expression and parallel structure.
Subject is substances and that refers to it so the verb should be plural.
Idiom: both x and y.
llism: .....................become and ............remain.
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Re: SC. Genes [#permalink]

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03 Jun 2008, 12:49
wizardofwashington 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
(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

(Source: Original source unknown; secondary source Beat The GMAT forums)

A,B- Out (Sub-Verb Agreement Wrong) one of the substances ...tell
C,D out .. both..or wrong construction

E -- left.. E sounds not great!!! ... Am I missing something?
But I have to pick one of them.. .... that is E.
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Re: SC. Genes [#permalink]

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03 Jun 2008, 12:54
suresh,
the word "substances" is followed immediately by "that" which means the modifying phrase correctly modifies substances.
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Re: SC. Genes [#permalink]

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03 Jun 2008, 13:08
suresh,
the word "substances" is followed immediately by "that" which means the modifying phrase correctly modifies substances.

oooppps!!! how did I miss that " that.. that that "

Thanks
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Re: SC. Genes [#permalink]

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03 Jun 2008, 15:06
OA is A.
Re: SC. Genes   [#permalink] 03 Jun 2008, 15:06
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