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When the technique known as gene-splicing was invented in

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When the technique known as gene-splicing was invented in [#permalink] New post 17 Jul 2005, 01:37
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E

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When the technique known as gene-splicing was invented in the early 1970's, it was feared that scientists might inadvertently create an "Andromeda strain,", a microbe never before seen on Earth that might escape from the Laboratory and it would kill vast numbers of humans who would have no natural defenses against it.

a)
b) it might kill vast numbers of humans with no natural defenses against it.
c) kill vast numbers of humans who have no natural defenses against it.
d)kill vast numbers of humans who would have no natural defenses against it.
e) kill vast numbers of humans with no natural defenses against it.

Please explain the answer thoroughly.
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 [#permalink] New post 17 Jul 2005, 02:01
C

A and B are discarded since the sentence is parallel in the form -
" a microbe ... might escape and kill...."

in d - who would have is wordy and kind of chnages hte meaning of the sentence.

e-- is close, but with is inappropriate
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 [#permalink] New post 17 Jul 2005, 03:37
I'll pick D.

In A & B, it doesn't point to the right referent ie. the micro.

Among C, D & E, D sounds righ by the use of 'would have'
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 [#permalink] New post 17 Jul 2005, 06:50
gmat2me2 wrote:
C....


"have no natural defenses"
-without knowing what the microbe can be, it can't be determined if ppl have defenses against it.

Picked D.

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 [#permalink] New post 17 Jul 2005, 08:04
d it is.

Only choices left that are correct are D and E
A and B are out because of parallelism
c is out - because there might be a microbe, so need future perfect (would have)

E distorts the meaning. E says the microbe will kill humans with no natural defence against it. is it humans or microbe who has no natural defence against microbe
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Re: SC- Gene Splicing [#permalink] New post 17 Jul 2005, 20:26
D is correct. Would is required to expressed the speculationj in the past.
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 [#permalink] New post 17 Jul 2005, 23:40
OA is D.

I was confused why would have was used but now i m pretty clear.

Thanks for explaining it.
  [#permalink] 17 Jul 2005, 23:40
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