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In 1994, a team of scientists led by David McKay began

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In 1994, a team of scientists led by David McKay began [#permalink] New post 13 Jul 2005, 18:19
In 1994, a team of scientists led by David McKay began studying the meteorite ALH84001, which had been discovered in Antarctica in 1984.Two years later, the McKay team announced that ALH84001, which scientists generally agree originated on Mars, contained compelling evidence that life once existed on Mars. This evidence includes the discovery of organic molecules in ALH84001, the first ever found in Martian rock. Organic molecules--complex, carbonbased compounds--form the basis for terrestrial life. The organic molecules found in ALH84001 are polycyclic aromatic hydrocarbons, or PAH's. When microbes die, their organic material often decays into PAH's.
Skepticism about the McKay team's claim remains, however. For example, ALH84001 has been on earth for 13,000 years, suggesting to some scientists that its PAH's might have resulted form terrestrial contamination. However, McKay's team has demonstrated that the concentration of PAH's increases as one looks deeper into ALH84001, contrary to what one would expect from terrestrial contamination.The skeptic's strongest argument, however, is that processes unrelated to organic life can easily produce all the evidence found by McKay' steam, including PAH's. For example, star formation produces PAH's. Moreover, PAH's frequently appear in other meteorites, and no one attributes their presence to life processes. Yet McKay's team notes that the particular combination of PAH's in ALH84001 is more similar to the combinations produced by decaying organisms than to those originating form nonbiological processes.
Q1:
The passage asserts which of the following about the claim that ALH84001 originated on Mars?

A. It was initially proposed by the McKay team of scientists.
B. It is not a matter of widespread scientific dispute.
C. It has been questioned by some skeptics of the McKay team's work.
D. It has been undermined by recent work on PAH's.
E. It is incompatible with the face that ALH84001 has been on Earth for 13,000 years.
Q2:
The primary purpose of the passage is to

A. describe new ways of studying the possibility that life once existed on Mars
B. revise a theory regarding the existence of life on Mars in light of new evidence
C. reconcile conflicting viewpoints regarding the possibility that life once existed on Mars
D. evaluate a recently proposed argument concerning the origin of ALH84001
E. describe a controversy concerning the significance of evidence from ALH84001
Q3:
The passage suggests that the fact that ALH84001 has been on earth for 13,000 years has been used by some scientists to support which of the following claims about ALH84001?

A. ALH84001 may not have originated on Mars.
B. ALH84001 contains PAH's that are the result of nonbiological processes.
C. ALH84001 may not have contained PAH's when it landed on Earth.
D. The organic molecules found in ALH84001 are not PAH's.
E. The organic molecules found in ALH84001 could not be the result of terrestrial contamination


Edit: Discussion of this question is here:
in-1994-a-team-of-scientists-led-by-160819.html

Last edited by bb on 02 Oct 2013, 10:43, edited 1 time in total.
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Re: In 1994, a team of scientists led by David McKay began [#permalink] New post 02 Jan 2013, 05:55
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Re: Time for an RC [#permalink] New post 13 Jul 2005, 21:05
Q1:B
Q2:D
Q3:B
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 [#permalink] New post 14 Jul 2005, 10:13
Ans1: B
Ans2: E
Ans3: C

1b, because - no one disputes that the ALH84001 originated in Mars.

2e, because - the PAH evidence found in ALH84001 is a matter of debate over the possibility that Life existed on Mars

d is wrong because no one is discussing the origins of ALH84001

3b, Refer to - "For example, ALH84001 has been on earth for 13,000 years, suggesting to some scientists that its PAH's might have resulted form terrestrial contamination. " Meaning that the PAHs were not present when ALH84001 entered earth.
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 [#permalink] New post 04 Nov 2005, 18:39
B
E
B
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 [#permalink] New post 05 Nov 2005, 03:07
B/E/B

Q2 the evidence found in AH13123134234 is the main point and wether it is significant to state that there was life on mars.

Q3 one rebutal: PAH could have resulted from teresstial contamination. But the strongest rebutal: PAH can emerger from nonbiological processses, like with other stars.
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 [#permalink] New post 05 Nov 2005, 03:56
B/E/C.

The last question is a bit more difficult that the others two questions.
The author says "ALH84001 has been on earth for 13,000 years, suggesting to some scientists that its PAH's might have resulted form terrestrial contamination". For me this help to choose C over B.
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 [#permalink] New post 05 Nov 2005, 04:09
I agree on Q3 to C

I was answering the question about why generally evidence of PAH is doubtful on AH23423

But the question specifically addresses the fact, that AH23234 has been on earth for 13,000 years. This is directly pointed to the first rebulta, bout the teresstial contamination.

nb. yes I know I cannot do this on d-day :P
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 [#permalink] New post 08 Nov 2005, 05:35
1.B
2.C
3.C

but the question is old, i am not sure we will get any OA, that's too bad :cry:
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My answer [#permalink] New post 08 May 2006, 06:08
B/E/C

The third one is a bit tricky.

The skeptics may say that the rock could be contaminated both through biological or non-biological process after it landed on earth. The skeptics don't really care how it was contaminatedt.

However, the skeptics want to say that the rock didn't have the material when it landed on Earth first.

So the choice should be C.
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Re: In 1994, a team of scientists led by David McKay began [#permalink] New post 09 Dec 2011, 00:19
I know it has been ages since the last post in this thread. But I wanted a confirmation on the correct answer for Question 3.

The passage says two vital things about PAHs:
1. ALH84001 has been on earth for 13,000 years, suggesting to some scientists that its PAH's might have resulted from terrestrial contamination
2. The skeptic's strongest argument, however, is that processes unrelated to organic life can easily produce all the evidence found by McKay' steam, including PAH's

In light of these two statements, can we conclude that processes unrelated to organic life (nonbiological processes) could have caused the formation of PAHs?
In that case, option B is the strongest contender because the critics say that terrestrial contamination could have been the cause for the PAHs. Hence, the PAHs could well be the result of nonbiological processes, right?

Please help me understand...TIA.
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Re: In 1994, a team of scientists led by David McKay began [#permalink] New post 14 Dec 2011, 00:10
BEC
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Re: In 1994, a team of scientists led by David McKay began [#permalink] New post 14 Dec 2011, 21:21
bec

What's OA?
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Re: In 1994, a team of scientists led by David McKay began [#permalink] New post 24 Jan 2012, 08:05
my answer is BEC
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Re: In 1994, a team of scientists led by David McKay began [#permalink] New post 25 Jan 2012, 23:36
B/E/C but OA ?
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Re: In 1994, a team of scientists led by David McKay began [#permalink] New post 02 Jan 2013, 03:31
I got most of the Questions wrong in this RC..

My weakness area is inference in RCs..

how do I improve in Inference in RCs?
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Re: In 1994, a team of scientists led by David McKay began   [#permalink] 02 Jan 2013, 03:31
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