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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] New post 10 Apr 2007, 14:27
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179. 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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 [#permalink] New post 10 Apr 2007, 21:11
I will go with D!!

Explanation

It says "one of the substances", which is singular and hence tells will follow and not the tell, between C and D, D for parallelism.

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 [#permalink] New post 10 Apr 2007, 21:30
Amardeep Sharma wrote:
I will go with D!!

Explanation

It says "one of the substances", which is singular and hence tells will follow and not the tell, between C and D, D for parallelism.

regards,

Amardeep


The intent of the sentence is to say that "There are many substances that 'do something'. Scientists have found one of those substances. Even though the scientists found only substance, the action 'do something' is common across all the substances. Thus we need a plural form and I agree with others that A is the best answer.

Amardeep, here is another thread in which I had emphasized this.

http://www.gmatclub.com/phpbb/viewtopic ... ht=trenton
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 [#permalink] New post 10 Apr 2007, 21:35
A stands correct.

I posted this sometime back.
http://www.gmatclub.com/phpbb/viewtopic.php?t=29044

The correct form is "Both X and Y".
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 [#permalink] New post 10 Apr 2007, 21:36
Agree with what ncprasad explained above.
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 [#permalink] New post 11 Apr 2007, 01:24
It is clearly (A), -as already mentioned by buzzgaurav- because of the idiomatic expression '..both X and Y' and it is parallel 'when to become active and when to remain'.

I would suggest to post a clear explanation why something is right/wrong, so all of us can share your knowledge. Even if something is wrong, we all can learn a lot from the nasty traps. It is not useful to post A or B or C or D or E?! Best regards, thank you and cheers!
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 [#permalink] New post 11 Apr 2007, 05:01
Dear NC Prasad.

Point taken, and its a good explanation... thanks pal

regards,

Amardeep
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[#permalink] New post 11 Apr 2007, 06:41
Both X and Y is correct usage. hence B,C, D are incorrect
The parts after "both" and "and" have to be parallel.

A maintains the parallelism -->
both when to become active and when to remain quiescent

E unnecessarily uses future tense (will tell) and lacks parallelism.

Hence A.
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 [#permalink] New post 11 Apr 2007, 14:27
OA is A.

thanks guys!

I was thinking in the same direction as Amardeep and got this one wrong.
  [#permalink] 11 Apr 2007, 14:27
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