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RC Passage - Princeton

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rashmi.kaushal Senior | Next Rank: 100 Posts Default Avatar
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RC Passage - Princeton

Post Wed Aug 11, 2010 6:24 am
Editor's note: The Princeton Review update as of August 2010

Get The Princeton Review discounts: Latest The Princeton Review Course promo codes http://www.beatthegmat.com/mba/partners/the-princeton-review-gmat-discount

---------



1 Researchers of prebiotic chemical
reactions have been testing the theory
that early life could have come about
through RNA alone, gradually giving
5 way to a world in which RNA and DNA
work together.
Experiments conducted in 1983
showed that RNA molecules can split
themselves and recombine in new
10 arrangements, leading to the conclusion
that life could have begun without
naturally occurring complex protein
enzymes. That the protein could be
formed by the elements at hand was
15 demonstrated as early as 1953, in an
experiment by Drs. Urey and Miller.
They filled a sealed flask with
substances considered to have been
plentiful in the earth’s prebiotic state-
20 methane, ammonia, water vapor,
hydrogen, and carbon dioxide-and
subjected the mixture to simulated
lightning strikes. Within weeks the
mixture contained the amino acids
25 necessary to build proteins. By
experimenting further, Dr. Miller was
able to create 13 of the 20 amino acids
necessary for life.
The RNA theory was then generally
30 accepted by most biologists, but the
question remained: how could RNA
exist without its requisite precursors,
cytosine and uracil? This problem now
appears to have been solved, again by
35 Dr. Miller. He postulates that both
substances could have been produced
in the prebiotic ocean through a process
that entails the evaporation of sea
water, the freezing of sea water in the
40 polar ice caps, and the mixing of the two
in the ocean.

According to the passage, which of the following is true of the experiment performed by Drs. Urey and Miller in 1953?

A)RNA was fabricated out of simple prebiotic substances.
B)More than one dozen significant amino acids were synthesized.
C)The experiment took several weeks to complete.
D)Cytosine and uracil formed in the sealed beaker.
E)The experiment was conducted in a flask filled with protein enzymes.

What should be the correct Answer ? Why is not B ?
C

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tgou008 Senior | Next Rank: 100 Posts Default Avatar
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Post Tue Feb 22, 2011 10:04 am
This was quite a tough onep; normally I can narrow it down to at least 2 answers, but here none of them except C are quite right and even C while that was my final answer 'felt odd' so I found myself re-reading the passage and possible answers over again; wasting time!

But ultimately C is the only one I couldn't eliminate based off the contents of the passage.

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maddy2u Senior | Next Rank: 100 Posts
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Post Mon Dec 20, 2010 9:16 am
IMO C

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Prashantbhardwaj Senior | Next Rank: 100 Posts Default Avatar
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Post Fri Aug 13, 2010 2:51 am
Not B because it has been stated ahead in the passage that the 13 amino acids were produced by further experimentation, not in the same experiment.

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kvcpk Legendary Member
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Post Fri Aug 13, 2010 4:24 am
I gave this test today and got the same doubt. I chose A for this. Sad
I dont agree with C as OA here.
I was about to post and you posted ahead of me Smile

_________________
"Once you start working on something,
don't be afraid of failure and don't abandon it.
People who work sincerely are the happiest."
Chanakya quotes (Indian politician, strategist and writer, 350 BC-275BC)

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selango Legendary Member
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Post Fri Aug 13, 2010 8:26 am
"The protein could be formed by the elements at hand was demonstrated as early as 1953, in an experiment by Drs. Urey and Miller"

1.They filled a sealed flask with substances considered to have been plentiful in the earth’s prebiotic state.

2.Within weeks the mixture contained the amino acids 25 necessary to build proteins.

Amino acids not proteins fabricated out of prebiotic substances.

By experimenting further, Dr. Miller was able to create 13 of the 20 amino acids necessary for life.

In further experiment only amino acids were synthesized.Not in the same experiment by Drs. Urey and Miller

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kvcpk Legendary Member
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Post Fri Aug 13, 2010 8:36 am
selango wrote:
"The protein could be formed by the elements at hand was demonstrated as early as 1953, in an experiment by Drs. Urey and Miller"

1.They filled a sealed flask with substances considered to have been plentiful in the earth’s prebiotic state.

2.Within weeks the mixture contained the amino acids 25 necessary to build proteins.

Amino acids not proteins fabricated out of prebiotic substances.

By experimenting further, Dr. Miller was able to create 13 of the 20 amino acids necessary for life.

In further experiment only amino acids were synthesized.Not in the same experiment by Drs. Urey and Miller
I didnt get you Anand. You were supporting C??

If so my question is
When the passage says "with in weeks....."

How can the right answer say it took several weeks?

_________________
"Once you start working on something,
don't be afraid of failure and don't abandon it.
People who work sincerely are the happiest."
Chanakya quotes (Indian politician, strategist and writer, 350 BC-275BC)

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selango Legendary Member
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Post Fri Aug 13, 2010 8:40 am
Praveen,

I am also not convenient with C.But C seems to better than other options.

Options A and B are not correct as I mentioned in the previous post.

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GMAT/MBA Expert

Post Fri Aug 13, 2010 10:17 am
Researchers of prebiotic chemical
reactions have been testing the theory
that early life could have come about
through RNA alone, gradually giving
5 way to a world in which RNA and DNA
work together.
Experiments conducted in 1983
showed that RNA molecules can split
themselves and recombine in new
10 arrangements, leading to the conclusion
that life could have begun without
naturally occurring complex protein
enzymes. That the protein could be
formed by the elements at hand was
15 demonstrated as early as 1953, in an
experiment by Drs. Urey and Miller.
They filled a sealed flask with
substances considered to have been
plentiful in the earth’s prebiotic state-
20 methane, ammonia, water vapor,
hydrogen, and carbon dioxide-and
subjected the mixture to simulated
lightning strikes. Within weeks the
mixture contained the amino acids
25 necessary to build proteins.
By
experimenting further, Dr. Miller was
able to create 13 of the 20 amino acids
necessary for life.
The RNA theory was then generally
30 accepted by most biologists, but the
question remained: how could RNA
exist without its requisite precursors,
cytosine and uracil? This problem now
appears to have been solved, again by
35 Dr. Miller. He postulates that both
substances could have been produced
in the prebiotic ocean through a process
that entails the evaporation of sea
water, the freezing of sea water in the
40 polar ice caps, and the mixing of the two
in the ocean.

According to the passage, which of the following is true of the experiment performed by Drs. Urey and Miller in 1953?

A)RNA was fabricated out of simple prebiotic substances. No. The highlighted portion doesn't say that they fabricated RNA itself; it says only that the mixture contained the elements necessary to build proteins.
B)More than one dozen significant amino acids were synthesized. No. This was done by Dr. Miller alone upon further experimentation.
C)The experiment took several weeks to complete. Correct. The highlighted portion says that within weeks the mixture contained the amino acids, so the experiment took more than 1 week.
D)Cytosine and uracil formed in the sealed beaker. No. Cytosine and uracil are not discussed in the highlighted portion.
E)The experiment was conducted in a flask filled with protein enzymes. No. Protein enzymes are not mentioned in the highlighted portion.


A word of advice:

The best way to ensure that you have found the correct answer is to point to the lines in the passage that support your answer choice. If you can't point to the exact words in the passage that support your answer choice, the answer choice is probably not correct.

_________________
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GMATGuruNY@gmail.com
If you find one of my posts helpful, please take a moment to click on the "UPVOTE" icon.
Available for tutoring in NYC and long-distance.
For more information, please email me at GMATGuruNY@gmail.com.

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kvcpk Legendary Member
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Post Fri Aug 13, 2010 3:13 pm
GMATGuruNY wrote:
C)The experiment took several weeks to complete. Correct. The highlighted portion says that within weeks the mixture contained the amino acids, so the experiment took more than 1 week.
Thanks for your response Mitch. However, I am still unable to believe answer is C.

Option C says that the experiment took several weeks to complete. Intended meaning of option C is way too many weeks.

The passage says within weeks the mixture contained...
intended meaning in the passage is that it did not take too many weeks(For example, it did not take months)

Though the other options are not close, I believe this option is equally bad. I eliminated it as opposite answer.

_________________
"Once you start working on something,
don't be afraid of failure and don't abandon it.
People who work sincerely are the happiest."
Chanakya quotes (Indian politician, strategist and writer, 350 BC-275BC)

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Post Fri Aug 13, 2010 4:43 pm
kvcpk wrote:
GMATGuruNY wrote:
C)The experiment took several weeks to complete. Correct. The highlighted portion says that within weeks the mixture contained the amino acids, so the experiment took more than 1 week.
Thanks for your response Mitch. However, I am still unable to believe answer is C.

Option C says that the experiment took several weeks to complete. Intended meaning of option C is way too many weeks.

The passage says within weeks the mixture contained...
intended meaning in the passage is that it did not take too many weeks(For example, it did not take months)

Though the other options are not close, I believe this option is equally bad. I eliminated it as opposite answer.
Be careful with RC. Don't interpret; just read and comprehend. The correct answer choice has to be justified by the actual words used, not by what someone might interpret. What if your interpretation is different from mine?

Passage: Within weeks the mixture contained the amino acids 25 necessary to build proteins.
Answer choice C:The experiment took several weeks to complete.


Within weeks means more than 1 week.
Several means an indefinite, small number. It does not mean that the experiment took longer than had been expected. While we might like to interpret the answer choice this way, such an interpretation goes beyond what the words actually say.

_________________
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GMAT Private Tutor
GMATGuruNY@gmail.com
If you find one of my posts helpful, please take a moment to click on the "UPVOTE" icon.
Available for tutoring in NYC and long-distance.
For more information, please email me at GMATGuruNY@gmail.com.

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Black Knight Senior | Next Rank: 100 Posts Default Avatar
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Post Wed Feb 23, 2011 9:23 pm
Tricky one but C makes the most sense to me. Good expln. there by GMATGuruNY.

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Target2009 Legendary Member
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Post Thu Feb 24, 2011 2:22 pm
1 more to C

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------------------------------
MasterGmat Student

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tabsang Senior | Next Rank: 100 Posts
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Post Mon Jul 04, 2011 9:51 am
IMHO its C.
Here's why:

A) RNA was fabricated out of simple prebiotic substances.

We don't know whether the prebiotic substances were simple.
All we know from the passage is that RNA was fabricated out of prebiotic substances in the experiment.

B) More than one dozen significant amino acids were synthesized.

13 amino acids were synthesized in all i.e. a few during the experiment, and few after further experimenting but not in the same experiment. Moreover, we also don't know whether these 13 were the significant ones among the 20 necessary for life.

C) The experiment took several weeks to complete.

Bingo. mentioned clearly in the passage.

D) Cytosine and uracil formed in the sealed beaker.

No mention of this.

E) The experiment was conducted in a flask filled with protein enzymes.

In fact the experiment was conducted to show the formation of these enzymes and amino acids.

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saurabh2525_gupta Senior | Next Rank: 100 Posts Default Avatar
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Post Sun Aug 21, 2011 8:17 am
rashmi.kaushal wrote:
1 Researchers of prebiotic chemical
reactions have been testing the theory
that early life could have come about
through RNA alone, gradually giving
5 way to a world in which RNA and DNA
work together.
Experiments conducted in 1983
showed that RNA molecules can split
themselves and recombine in new
10 arrangements, leading to the conclusion
that life could have begun without
naturally occurring complex protein
enzymes. That the protein could be
formed by the elements at hand was
15 demonstrated as early as 1953
, in an
experiment by Drs. Urey and Miller.
They filled a sealed flask with
substances considered to have been
plentiful in the earth’s prebiotic state-
20 methane, ammonia, water vapor,
hydrogen, and carbon dioxide-and
subjected the mixture to simulated
lightning strikes. Within weeks the
mixture contained the amino acids
25 necessary to build proteins
. By
experimenting further, Dr. Miller was
able to create 13 of the 20 amino acids
necessary for life.
The RNA theory was then generally
30 accepted by most biologists, but the
question remained: how could RNA
exist without its requisite precursors,
cytosine and uracil? This problem now
appears to have been solved, again by
35 Dr. Miller. He postulates that both
substances could have been produced
in the prebiotic ocean through a process
that entails the evaporation of sea
water, the freezing of sea water in the
40 polar ice caps, and the mixing of the two
in the ocean.

According to the passage, which of the following is true of the experiment performed by Drs. Urey and Miller in 1953?

A)RNA was fabricated out of simple prebiotic substances.
B)More than one dozen significant amino acids were synthesized.
C)The experiment took several weeks to complete.
D)Cytosine and uracil formed in the sealed beaker.
E)The experiment was conducted in a flask filled with protein enzymes.

What should be the correct Answer ? Why is not B ?
C
Hi Mitch,

Thank you for replying. That was quiet useful. I have a query here.
In the text marked in orange. The scientist set to prove protein can be synthesized but they proved that amino acid can be synthesized.

Also in the passage there is no clear indication that RNA is a protein or an amino acid, we can rule out A for that.

Please suggest.

Thanks,
JOHN

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