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In 1994 a team of scientists led by

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In 1994 a team of scientists led by [#permalink] New post 30 Sep 2013, 21:43
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Verbal Review Practice Passage
Passage No.: 4
Questions: 18 to 23
Page: 28 & 29
Difficulty:

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, carbon-based compounds— form the basis for terrestrial life. The organic molecules found in ALH84001 are poly cyclic aromatic hydrocarbons, or PAHs. When microbes die, their organic material often decays into PAHs.


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 PAHs might have resulted from terrestrial contamination. However, McKay’s team has demonstrated that the concentration of PAHs increases as one looks deeper into ALH84001, contrary to what one would expect from terrestrial contamination. The skeptics’ strongest argument, however, is that processes unrelated to organic life can easily produce all the evidence found by McKay’s team, including PAHs. For example, star formation produces PAHs. Moreover, PAHs frequently appear in other meteorites, and no one attributes their presence to life processes. Yet McKay’s team notes that the particular combination of PAHs in ALH84001 is more similar to the combinations produced by decaying organisms than to those originating from non biological processes.

1. 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
[Reveal] Spoiler: OA
E

2. 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 PAHs.
(E) It is incompatible with the fact that ALH84001 has been on Earth for 13,000 years.
[Reveal] Spoiler: OA
B

3. 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 PAHs that are the result of nonbiological processes.
(C) ALH84001 may not have contained PAHs when it landed on Earth.
(D) The organic molecules found in ALH84001 are not PAHs.
(E) The organic molecules found in ALH84001 could not be the result of terrestrial contamination.
[Reveal] Spoiler: OA
C

4. The passage suggests that if a meteorite contained PAHs that were the result of terrestrial contamination, then one would expect which of the following to be true?

(A) The meteorite would have been on Earth for more than 13,000 years.
(B) The meteorite would have originated from a source other than Mars.
(C) The PAHs contained in the meteorite would have originated from nonbiological processes.
(D) The meteorite would contain fewer PAHs than most other meteorites contain.
(E) The PAHs contained in the meteorite would be concentrated toward the meteorite’s surface.
[Reveal] Spoiler: OA
E

5. Which of the following best describes the function of the last sentence of the first paragraph?

(A) It identifies a possible organic source for the PAHs found in ALH84001.
(B) It describes a feature of PAHs that is not shared by other types of organic molecules.
(C) It explains how a characteristic common to most meteorites originates.
(D) It suggests how the terrestrial contamination of ALH84001 might have taken place.
(E) It presents evidence that undermines the claim that life once existed on Mars.
[Reveal] Spoiler: OA
A

6. The passage suggests that McKay’s team would agree with which of the following regarding the PAHs produced by non organic processes?

(A) These PAHs are not likely to be found in any meteorite that has been on Earth for 13,000 years or more.
(B) These PAHs are not likely to be found in any meteorite that originated from Mars.
(C) These PAHs are not likely to be produced by star formation.
(D) These PAHs are likely to be found in combinations that distinguish them from the PAHs produced by organic processes.
(E) These PAHs are likely to be found in fewer meteorites than the PAHs produced by organic processes.
[Reveal] Spoiler: OA
D



OE to be given later
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Last edited by dentobizz on 21 Oct 2013, 20:47, edited 1 time in total.
Formatting for verbal review project
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Re: In 1994 a team of scientists led by [#permalink] New post 01 Oct 2013, 11:44
Went;
E,B,C,E,B,D miss read which sentence it was.
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Re: In 1994 a team of scientists led by [#permalink] New post 01 Oct 2013, 19:55
OE #1 : Only option E correctly states that a controversy is described

OE #2 :The passage states scientist generally agree hence it is not a disputed matter.

OE #3 : This is a 'Supporting Ideas' questions. Lines 4-5 in second paragraph point to C

OE #4 : Answering 'Application' question involves applying information contained in the passage to a situation that is not described in the passage. The passage also indicates that if terrestrial contamination occurred with ALH84001, then, contrary to the findings of McKay’s team that showed PAH concentration increases as one looks deeper into ALH84001 (lines 21–22), the PAHs would be expected to be concentrated more toward the outer parts, or surface, of ALH84001

OE #5 : 'Evaluation' questions require understanding how a part of the passage functions within the passage as a whole. The final sentence of the first paragraph indicates that one source of PAHs is the decay of dead microbes.

OE #6: It is an inference question McKay’s team notes in { lines 29–34 }that the PAH combinations produced by organic processes can be distinguished from those produced by non organic processes
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Re: In 1994 a team of scientists led by [#permalink] New post 01 Oct 2013, 20:48
Link for a similar discussion

in-1994-a-team-of-scientists-led-by-david-mckay-began-17963.html?fl=similar
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Re: In 1994 a team of scientists led by [#permalink] New post 02 Oct 2013, 02:01
1-e,2.-d,3-d,4-e,5-a,6-e

took 15 min
after revealing the answer gotta know that out of 6 i got 3 right.

want explanation for 2,3,6 , and how much time ideally we must target to finish.

Rgds
Prasannajeet
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Re: In 1994 a team of scientists led by [#permalink] New post 02 Oct 2013, 02:31
Quote:
Went;
E,B,C,E,B,D miss read which sentence it was.


Hi Valerun,
Pls. rephrase and post your entire question so that someone can answer it correctly.

From what I gather, you got the 5th RC question wrong and would like to know which sentence points to the correct option ( A)
As mentioned in the OE --It is the last sentence of the first paragraph "When microbes die, their organic material often decays into PAHs."
Hope this answers your question

prasannajeet wrote:
1-e,2.-d,3-d,4-e,5-a,6-e
took 15 min
after revealing the answer gotta know that out of 6 i got 3 right.

want explanation for 2,3,6 , and how much time ideally we must target to finish.
Rgds
Prasannajeet


Hi Prasannajeet,
Have you read the given OE for 2,3,6?
Even after reading the OE if you have any specific doubts then do post them.

Time depends on your technique (skimming and re-reading for details OR reading once with details)
for short RC passage (only reading) on an average should take anywhere from 1-1.30 mins
Thereafter answering question around a 45 secs to 1.15 min per question (this will vary depending the question length,type,and difficulty)

Please go through the the link for RC strategy
all-rc-strategy-official-q-by-experts-legendary-club-members-145027.html

HTH
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Re: In 1994 a team of scientists led by [#permalink] New post 28 Oct 2013, 02:54
i take 7min 5 right
is this timing good or not ?
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Re: In 1994 a team of scientists led by [#permalink] New post 28 Oct 2013, 02:59
IMO 7 mins for reading and solving 6 questions with 5 correct is good
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Re: In 1994 a team of scientists led by   [#permalink] 28 Oct 2013, 02:59
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