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# Biologists believe that they have found one of the

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

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15 Aug 2006, 00:53
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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 and should remain
(C) tells individual genes both when to become active and when to remain
(D) tells individual genes both when to activate and when to
(E) tell an individual gene both about when it should become active and when it should remain

Last edited by GMATT73 on 15 Aug 2006, 04:35, edited 1 time in total.
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15 Aug 2006, 01:40
(A) tell individual genes both when to become active and when to remain
nok, should be "tells"
(B) tell individual genes both at which time they should become active and should remain
nok. at which time they should - wordy
(C) tells individual genes both when to become active and when to remain
ok, SV agreement, both x and y
(D) tells individual genes both when to activate and when to
nok. to activate what?
(E) tell an individual gene both about when it should become active and when it should remain
nok, sv agreement pb.
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15 Aug 2006, 01:47
Another vote for (C)

Logic:

1. tells (+) vs. tell (-)
2. to become active and when to remain quiescent (+) vs. tells individual genes both when to activate and when to quiescent (-)

There is no ||ism in (D)
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15 Aug 2006, 02:02
I vote for A)
BIologist have found one of the substances that tell ..... The subject here is SUBSTANCES and plural verb is needed.
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15 Aug 2006, 02:20

'one of substances that' requires plural verb...
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15 Aug 2006, 03:32
I've missed this point of plural subject.

How can we rewrite the sentence to say that the substance that "tells" is unique among the others substances that dont "tell"?
Wd it be different if it were like :

Biologists believe that they have found one of the substances, that tells individual genes both when to become active and when to remain quiescent in the earliest phases of an embryo's development.

OR

Biologists believe that they have found one out of hundred substances that tells individual genes both when to become active and when to remain quiescent in the earliest phases of an embryo's development.
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15 Aug 2006, 04:28
Let`s wait for some more discussion on this one...
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Re: SC: Genetic mystery unraveled. Who can decipher this one [#permalink]

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15 Aug 2006, 08:33
GMATT73 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 and should remain
(C) tells individual genes both when to become active and when to remain
(D) tells individual genes both when to activate and when to
(E) tell an individual gene both about when it should become active and when it should remain

Vote for A.

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.
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15 Aug 2006, 08:46
A - Almost sure.

(B) tell individual genes both at which time they should become active and ["at which time they" is missing] should remain : NOT || - both X and Y. X and Y should be ||. Also even if ||ism is done its wordy
(C) tells individual genes both when to become active and when to remain: S-V agreement
(D) tells individual genes both when to activate and when to: S-V agreement
(E) tell an individual gene both about when it should become active and when it should remain: NOT || - both X and Y. X and Y should be ||
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15 Aug 2006, 08:52
Should be A.
Correct construction is "both X and Y"

This is the discussion when I posted this same question :

http://www.gmatclub.com/phpbb/viewtopic.php?t=29044
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15 Aug 2006, 09:41
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.

one of the substances is singular

(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 and should remain
No SV- Aggrement but parallel

(C) tells individual genes both when to become active and when to remain .
Correct . SV- Aggrement and parallel

(D) tells individual genes both when to activate and when to
SV- Aggrement and not parallel

(E) tell an individual gene both about when it should become active and when it should remain
No SV- Aggrement and not parallel
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15 Aug 2006, 10:09
A it is.

"substances that TELL", is appropriate

one of + plural noun + relative (that/which) + Verb

Verb after the relative "that" should agree with the plural noun.

the relative "that" normally associates itself with the closest noun (Substances) and not necessarily the subject ("One" in this case) and hence the verb should be conjugated to agree with "substances" rather than "One of..."

Another construction is
one of + plural noun + Verb ---------> in this case the verb must be singular in keeping with the subject.
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16 Aug 2006, 06:53
Good work gang, the OA is indeed (A)
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