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It is theoretically possible that bacteria developed on - Q1

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It is theoretically possible that bacteria developed on - Q1 [#permalink]

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It is theoretically possible that bacteria developed on Mars early in its history and that some were carried to Earth by a meteorite. However, strains of bacteria from different planets would probably have substantial differences in protein structure that would persist over time, and no two bacterial strains on Earth are different enough to have arisen on different planets. So, even if bacteria did arrive on Earth from Mars, they must have died out.

The argument is most vulnerable to which of the following criticisms?

(A) It fails to establish whether bacteria actually developed on Mars
(B) it fails to establish how likely it is that Martian bacteria were transported to Earth
(C) It fails to consider whether there were means other than meteorites by which Martian bacteria could have been carried to Earth.
(D) It fails to consider whether all bacteria now on Earth could have arisen from transported Martian bacteria.
(E) It fails to consider whether there could have been strains of bacteria that originated on Earth and later died out.

Note: There are two questions available with the similar stimulus and same first line but different question. The other question (complete the passage) is discussed in: it-is-theoretically-possible-that-bacteria-developed-on-q2-46449.html
[Reveal] Spoiler: OA

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 [#permalink]

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New post 27 Dec 2004, 18:48
I would also pick D. The argument fails to condisder whether all bacteria came from Mars...

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It is theoretically possible that bacteria developed on Mars [#permalink]

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New post 06 Apr 2008, 05:33
It is theoretically possible that bacteria developed on Mars early in its history and that some were carried to Earth by a meteorite. However, strains of bacteria from different planets would probably have substantial differences in protein structure that would persist over time, and no two bacterial strains on Earth are different enough to have arisen on different planets. So, even if bacteria did arrive on Earth from Mars, they must have died out.



The argument is most vulnerable to which of the following criticisms?


A. It fails to establish whether bacteria actually developed on Mars.

B. It fails to establish how likely it is that Martian bacteria were transported to Earth.

C. It fails to consider whether there were means other than meteorites by which Martian bacteria could have been carried to Earth.

D. It fails to consider whether all bacteria now on Earth could have arisen from transported Martian bacteria.

E. It fails to consider whether there could have been strains of bacteria that originated on Earth and later died out.
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Re: CR 30:19/30 [#permalink]

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New post 06 Apr 2008, 05:47
It is theoretically possible that bacteria developed on Mars early in its history and that some were carried to Earth by a meteorite. However, strains of bacteria from different planets would probably have substantial differences in protein structure that would persist over time, and no two bacterial strains on Earth are different enough to have arisen on different planets. So, even if bacteria did arrive on Earth from Mars, they must have died out.
The argument is most vulnerable to which of the following criticisms?

A. It fails to establish whether bacteria actually developed on Mars. irrevelant
B. It fails to establish how likely it is that Martian bacteria were transported to Earth. irrevelant
C. It fails to consider whether there were means other than meteorites by which Martian bacteria could have been carried to Earth. irrevelant
D. It fails to consider whether all bacteria now on Earth could have arisen from transported Martian bacteria.
The argument reports about 'strains of bacteria from different planets'
E. It fails to consider whether there could have been strains of bacteria that originated on Earth and later died out.
It could well be that all the bacteria living on Earth derived from Mars and the bacteria from Earth died out! Correct answer!

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Re: CR 30:19/30 [#permalink]

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prasannar wrote:
It is theoretically possible that bacteria developed on Mars early in its history and that some were carried to Earth by a meteorite. However, strains of bacteria from different planets would probably have substantial differences in protein structure that would persist over time, and no two bacterial strains on Earth are different enough to have arisen on different planets. So, even if bacteria did arrive on Earth from Mars, they must have died out.



The argument is most vulnerable to which of the following criticisms?


A. It fails to establish whether bacteria actually developed on Mars. The argument says "even ig bacteria did arrive on earth", so this point is irrelevant since we are assuming Mars had bacteria and it got to earth.

B. It fails to establish how likely it is that Martian bacteria were transported to Earth. Again, we have to assume that bacteria got transported to earth, since this is the basis of the argument.

C. It fails to consider whether there were means other than meteorites by which Martian bacteria could have been carried to Earth. its irrelevant how Martian bacteria got to earth.

D. It fails to consider whether all bacteria now on Earth could have arisen from transported Martian bacteria. The argument says that martian bacteria that arrived on earth died out. But this choice makes it possible that martian bacteria thrived on earth and didn't die out.

E. It fails to consider whether there could have been strains of bacteria that originated on Earth and later died out. this is irrelevant since we are trying to find out something that is against it arguement, i.e martian bacteria died out. This statement says nothing about martian bacteria

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Re: CR 30:19/30 [#permalink]

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New post 07 Apr 2008, 01:17
Any other thoughts? D or E? What is OA?

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Re: CR 30:19/30 [#permalink]

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New post 07 Apr 2008, 05:28
I agree with D. Will explain further if its correct. I must say its a nasty one - both E and D do sound plausible.

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Re: CR 30:19/30 [#permalink]

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New post 07 Apr 2008, 08:41
I would go with E.

D talks abt spawning of an Earth-version bacteria from the Martian one. In tht case they would have the same biological/DNA/RNA (blah blah :shock:) structure.. E is correct as it explores a possibility of the existence of a pure-Earth-version (born & brought up on earth :D) which would be biologically different from the martian version.

Hence E.. :D

Any counter arguments??

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Re: CR 30:19/30 [#permalink]

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New post 07 Apr 2008, 11:01
E

If e is true, then there were bacteria with different enough in protien structure, it is just that they died out. This means we cant determine if the bacteria are from mars or not. I didt pick d because stem says bacteria on earth exist

prasannar wrote:
It is theoretically possible that bacteria developed on Mars early in its history and that some were carried to Earth by a meteorite. However, strains of bacteria from different planets would probably have substantial differences in protein structure that would persist over time, and no two bacterial strains on Earth are different enough to have arisen on different planets. So, even if bacteria did arrive on Earth from Mars, they must have died out.



The argument is most vulnerable to which of the following criticisms?


A. It fails to establish whether bacteria actually developed on Mars.

B. It fails to establish how likely it is that Martian bacteria were transported to Earth.

C. It fails to consider whether there were means other than meteorites by which Martian bacteria could have been carried to Earth.

D. It fails to consider whether all bacteria now on Earth could have arisen from transported Martian bacteria.

E. It fails to consider whether there could have been strains of bacteria that originated on Earth and later died out.

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Re: CR 30:19/30 [#permalink]

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New post 07 Apr 2008, 13:59
A- hmm..
B-irrelevant to arg
C-irrelevant
D-irrelevant
E-hmm..

To summarize&confirm: What is the arg ? "even if the bac arrived frm MArs, they must have died "
LOok at A and E now...E hints that bac developed on earth might hv died !..and bac frm Mars survived ..
possible! Next, A is true as fact but A doesn't weaken the arg ..arg scope is: bac developed on Mars: may or may not but if they did, then they must have died on earth ( given the fact that structurally totally diff bac cant exist) which E negates..


I go with E


I found this a lil tricky!!

prasannar wrote:
It is theoretically possible that bacteria developed on Mars early in its history and that some were carried to Earth by a meteorite. However, strains of bacteria from different planets would probably have substantial differences in protein structure that would persist over time, and no two bacterial strains on Earth are different enough to have arisen on different planets. So, even if bacteria did arrive on Earth from Mars, they must have died out.



The argument is most vulnerable to which of the following criticisms?


A. It fails to establish whether bacteria actually developed on Mars.

B. It fails to establish how likely it is that Martian bacteria were transported to Earth.

C. It fails to consider whether there were means other than meteorites by which Martian bacteria could have been carried to Earth.

D. It fails to consider whether all bacteria now on Earth could have arisen from transported Martian bacteria.

E. It fails to consider whether there could have been strains of bacteria that originated on Earth and later died out.

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Re: CR 30:19/30 [#permalink]

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New post 07 Apr 2008, 14:14
E

Argument is making a conclusion that since all earth bacteria are not different enough they couldn't have arose from another planet.

However the argument fails to consider if previous strains of bacteria on earth that were different enough to have arose from another did exist on earth. (but died out which is why they are not around today)

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It is theoretically possible that bacteria developed on Mars [#permalink]

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New post 10 Jul 2009, 01:56
It is theoretically possible that bacteria developed on Mars early in its history and that some were carried to Earth by a meteorite. However, strains of bacteria from different planets would probably have substantial differences in protein structure that would persist over time, and no two bacterial strains on Earth are different enough to have arisen on different planets. So, even if bacteria did arrive on Earth from Mars, they must have died out.
The argument is most vulnerable to which of the following criticisms?
A. It fails to establish whether bacteria actually developed on Mars.
B. It fails to establish how likely it is that Martian bacteria were transported to Earth.
C. It fails to consider whether there were means other than meteorites by which Martian bacteria could have been carried to Earth.
D. It fails to consider whether all bacteria now on Earth could have arisen from transported Martian bacteria.
E. It fails to consider whether there could have been strains of bacteria that originated on Earth and later died out.

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Re: Bacteria from Mars [#permalink]

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New post 10 Jul 2009, 02:32
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D.

Conclusion: Since there is only one type of bacteria on earth, Martian bacteria has died out ( implies that all bacteria on Earth are the ones that originated on Earth )

There might be a possibility that all bacteria on Earth died out and so current strain of bacteria on Earth is the one that came from Mars. D brings out this flaw.

ankur55 wrote:
It is theoretically possible that bacteria developed on Mars early in its history and that some were carried to Earth by a meteorite. However, strains of bacteria from different planets would probably have substantial differences in protein structure that would persist over time, and no two bacterial strains on Earth are different enough to have arisen on different planets. So, even if bacteria did arrive on Earth from Mars, they must have died out.
The argument is most vulnerable to which of the following criticisms?
A. It fails to establish whether bacteria actually developed on Mars.
B. It fails to establish how likely it is that Martian bacteria were transported to Earth.
C. It fails to consider whether there were means other than meteorites by which Martian bacteria could have been carried to Earth.
D. It fails to consider whether all bacteria now on Earth could have arisen from transported Martian bacteria.
E. It fails to consider whether there could have been strains of bacteria that originated on Earth and later died out.

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Re: Bacteria from Mars [#permalink]

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New post 10 Jul 2009, 02:38
thanks for the explanation.
D is the correct answer.

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Re: Bacteria from Mars [#permalink]

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D.

Evidence: All bacteria on earth is from "one source"
Conclusion: bacteria from Mars have died out.

Author seems to have assumed that this "one source" is "earth". Option D directly attacks this assumption, by saying that all the bacteria from earth have died. So this "one source" must be Mars.
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Re: Bacteria from Mars [#permalink]

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New post 16 Dec 2009, 06:13
A. It fails to establish whether bacteria actually developed on Mars---it doesn’t need to establish when it has been theoretically established
B. It fails to establish how likely it is that Martian bacteria were transported to Earth----it has already established it theoretically
C. It fails to consider whether there were means other than meteorites by which Martian bacteria could have been carried to Earth. -------------out of scope
D. It fails to consider whether all bacteria now on Earth could have arisen from transported Martian bacteria. ----------CORRECT. If this were true then the argument would fall apart. As then the sole bacteria currently present could have been originated in Mars. So no distinction is needed.
E. It fails to consider whether there could have been strains of bacteria that originated on Earth and later died out.---it has already mentioned that they would have died out.

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It is theoretically possible that bacteria developed on Mars [#permalink]

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New post 21 Mar 2010, 12:31
It is theoretically possible that bacteria developed on Mars early in its history and that some were carried to Earth by a meteorite. However, strains of bacteria from different planets would probably have substantial differences in protein structure that would persist over time, and no two bacteria strains on Earth are different enough to have arisen on different planets. So, even if bacteria did arrive on Earth from Mars, they must have died out.

The argument is most vulnerable to which of the following criticism:
A: It fails to establish whether bacteria actually developed on Mars
B: It fails to establish how likely it is that Martian bacteria were transported to Earth
C: It fails to consider whether there were means other than meteorites by which Martian bacteria could have been carried to Earth
D: It fails to consider whether all bacteria now on Earth could have arisen from transported Martian bacteria
E: It fails to consider whether there could have been strains of bacteria that originated on Earth and later died out

OA =
[Reveal] Spoiler:
D

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Re: Martian bacteria on Earth [#permalink]

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It is theoretically possible that bacteria developed on Mars early in its history and that some were carried to Earth by a meteorite. Premise However, strains of bacteria from different planets would probably have substantial differences in protein structure that would persist over time, and no two bacteria strains on Earth are different enough to have arisen on different planets. Counter -premise
So, even if bacteria did arrive on Earth from Mars, they must have died out. - conclusion


Weaken question - find the choice that weakens the conclusion

A: It fails to establish whether bacteria actually developed on Mars - no where related to conclusion ,also author says theoretically possible

B: It fails to establish how likely it is that Martian bacteria were transported to Earth no where related to conclusion ,also author says meteroite
C: It fails to consider whether there were means other than meteorites by which Martian bacteria could have been carried to Earth -no where related to conclusion

D: It fails to consider whether all bacteria now on Earth could have arisen from transported Martian bacteria - correct ,if the bacteria on earth are arisen from mars bacteria that means mars bacteria did not die

E: It fails to consider whether there could have been strains of bacteria that originated on Earth and later died out
-no where related to conclusion

In weaken questions - look for the answer choices that attack the conclusion
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Re: Martian bacteria on Earth [#permalink]

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New post 23 Mar 2010, 00:33
I think its D.

A: It fails to establish whether bacteria actually developed on Mars - irrelevant
B: It fails to establish how likely it is that Martian bacteria were transported to Earth - irrelevant
C: It fails to consider whether there were means other than meteorites by which Martian bacteria could have been carried to Earth -it isn't necessary to know the mode of transport
D: It fails to consider whether all bacteria now on Earth could have arisen from transported Martian bacteria - if all the bacteria on Earth have been transported from Mars, then they haven't died out. Hence, correct !
E: It fails to consider whether there could have been strains of bacteria that originated on Earth and later died out - irrelevant

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Re: Martian bacteria on Earth [#permalink]

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New post 25 Dec 2010, 08:43
nifoui wrote:
It is theoretically possible that bacteria developed on Mars early in its history and that some were carried to Earth by a meteorite. However, strains of bacteria from different planets would probably have substantial differences in protein structure that would persist over time, and no two bacteria strains on Earth are different enough to have arisen on different planets. So, even if bacteria did arrive on Earth from Mars, they must have died out.

The argument is most vulnerable to which of the following criticism:
A: It fails to establish whether bacteria actually developed on Mars
B: It fails to establish how likely it is that Martian bacteria were transported to Earth
C: It fails to consider whether there were means other than meteorites by which Martian bacteria could have been carried to Earth
D: It fails to consider whether all bacteria now on Earth could have arisen from transported Martian bacteria
E: It fails to consider whether there could have been strains of bacteria that originated on Earth and later died out

OA =
[Reveal] Spoiler:
D

:done
Answer is D IMO . Reason is that the argument is based on the assumption that bacteria existed on earth prior to the skirmish with meteorites carrying Martian bacteria stains. D significantly weakens the conclusion "even if bacteria did arrive on Earth from Mars, they must have died out" .
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Re: Martian bacteria on Earth   [#permalink] 25 Dec 2010, 08:43

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