SC Post 4 : Apr 1 [One more with the same concept...]

[AIM GMAT]

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

[rohu27]

IMO A

[atulmangal]

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

IMO A

Plural tell is required as THAT Refer to substances also this is a set structure i mentioned earlier

One of the books that Are Not is

so C,D out

B,E and unnecessarily uses pronouns which is not required

[AIM GMAT]

OA A

[tetura84]

I feel I should mention the general pattern here.

One of the Xs + <singular>
One of the Xs that/who + <plural>
Only one of the Xs + <singular>
Only one of the Xs that/who + <plural>
The only one of the Xs that/who + <singular>

[singh181]

Thanks for putting it together.

I feel I should mention the general pattern here.

One of the Xs + <singular>
One of the Xs that/who + <plural>
Only of the Xs + <singular>
Only one of the Xs that/who + <plural>
The only of the Xs that/who + <plural>