A cup of raw milk, after being heated in a microwave oven to : GMAT Critical Reasoning (CR)
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# A cup of raw milk, after being heated in a microwave oven to

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Senior Manager
Joined: 03 Sep 2012
Posts: 338
Location: United States
Concentration: Healthcare, Strategy
GMAT 1: 730 Q48 V42
GPA: 3.88
WE: Medicine and Health (Health Care)
Followers: 16

Kudos [?]: 179 [0], given: 31

A cup of raw milk, after being heated in a microwave oven to [#permalink]

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28 Nov 2012, 04:09
00:00

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(N/A)

Question Stats:

79% (02:32) correct 21% (00:42) wrong based on 28 sessions

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A cup of raw milk, after being heated in a microwave oven to 50 degrees Celsius, contains half its initial concentration of a particular enzyme, lysozyme. If, however, the milk reaches that temperature through exposure to a conventional heat source of 50 degrees Celsius, it will contain nearly all of its initial concentration of the enzyme. Therefore, what destroys the enzyme is not heat but microwaves, which generate heat.

Which one of the following, if true, most seriously
weakens the argument?

(A) Heating raw milk in a microwave oven to a
temperature of 100 degrees Celsius destroys
nearly all of the lysozyme initially present in
that milk.

(B) Enzymes in raw milk that are destroyed through
excessive heating can be replaced by adding
enzymes that have been extracted from other
sources.

(C) A liquid exposed to a conventional heat source
of exactly 50 degrees Celsius will reach that
temperature more slowly than it would if it
were exposed to a conventional heat source
hotter than 50 degrees Celsius.

(D) Milk that has been heated in a microwave oven
does not taste noticeably different from milk
that has been briefly heated by exposure to a
conventional heat source.

(E) Heating any liquid by microwave creates small
zones within it that are much hotter than the
overall temperature that the liquid will
ultimately reach.

OA, after discussion
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Senior Manager
Joined: 22 Dec 2011
Posts: 298
Followers: 3

Kudos [?]: 233 [1] , given: 32

Re: A cup of raw milk, after being heated in a microwave oven... [#permalink]

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28 Nov 2012, 04:40
1
KUDOS
vomhorizon wrote:
A cup of raw milk, after being heated in a microwave oven to 50 degrees Celsius, contains half its initial concentration of a particular enzyme, lysozyme. If, however, the milk reaches that temperature through exposure to a conventional heat source of 50 degrees Celsius, it will contain nearly all of its initial concentration of the enzyme. Therefore, what destroys the enzyme is not heat but microwaves, which generate heat.

Which one of the following, if true, most seriously
weakens the argument?

(A) Heating raw milk in a microwave oven to a
temperature of 100 degrees Celsius destroys
nearly all of the lysozyme initially present in
that milk.

(B) Enzymes in raw milk that are destroyed through
excessive heating can be replaced by adding
enzymes that have been extracted from other
sources.

(C) A liquid exposed to a conventional heat source
of exactly 50 degrees Celsius will reach that
temperature more slowly than it would if it
were exposed to a conventional heat source
hotter than 50 degrees Celsius.

(D) Milk that has been heated in a microwave oven
does not taste noticeably different from milk
that has been briefly heated by exposure to a
conventional heat source.

(E) Heating any liquid by microwave creates small
zones within it that are much hotter than the
overall temperature that the liquid will
ultimately reach.

OA, after discussion

OA has to be E.

(A) Heating raw milk in a microwave oven to a
temperature of 100 degrees Celsius destroys
nearly all of the lysozyme initially present in
that milk.

- WORNG because it still doesn't show that the heat, not the microwaves, is killing the bacterium.

(B) Enzymes in raw milk that are destroyed through
excessive heating can be replaced by adding
enzymes that have been extracted from other
sources.

So? This is irrelevant to the argument.

(C) A liquid exposed to a conventional heat source
of exactly 50 degrees Celsius will reach that
temperature more slowly than it would if it
were exposed to a conventional heat source
hotter than 50 degrees Celsius.

this bring out wrong comparison.

(D) Milk that has been heated in a microwave oven
does not taste noticeably different from milk
that has been briefly heated by exposure to a
conventional heat source.

taste is irrelevant to the argument.

(E) Heating any liquid by microwave creates small
zones within it that are much hotter than the
overall temperature that the liquid will
ultimately reach.

PREFECT.
this weakens the link between the premise and conclusion.
Author's argument depends on the fact that even the conventional heat method reaches same 50 D but no germs are killed so microwaves generated in the Microwave is destroying germs. This option E shows that heat generated in the MW is more than 50 D making this comparisons invalid and the argument.

Im starting to like LSAT CRs

Kudos,if my posts helped.

Senior Manager
Joined: 03 Sep 2012
Posts: 338
Location: United States
Concentration: Healthcare, Strategy
GMAT 1: 730 Q48 V42
GPA: 3.88
WE: Medicine and Health (Health Care)
Followers: 16

Kudos [?]: 179 [0], given: 31

Re: A cup of raw milk, after being heated in a microwave oven... [#permalink]

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28 Nov 2012, 04:47
Quote:
Author's argument depends on the fact that even the conventional heat method reaches same 50 D but no germs are killed so microwaves generated in the Microwave is destroying germs.

This is exactly what the ANSWER CHOICE HINGES ON..Anyone who can pick this up from the Question stem (and the choices) will never confuse this answer choice with any other..

Quote:
Im starting to like LSAT CRs

They are quite similar to GMAT CR's just a bit tougher (what makes them BRUTAL is that the LSAT test takers are expected to solve each question in about 80 seconds).. I feel that no prep company quite replicates the subtle variations in answer choices the way the GMAT test makers do, and LSAT CR's are very similar.. I know of quite a few LSAT test takers who start practicing GMAT CR, after they have exhausted the nearly infinite Logical Reasoning questions LSAC puts out
_________________

"When you want to succeed as bad as you want to breathe, then you’ll be successful.” - Eric Thomas

Senior Manager
Joined: 22 Dec 2011
Posts: 298
Followers: 3

Kudos [?]: 233 [0], given: 32

Re: A cup of raw milk, after being heated in a microwave oven... [#permalink]

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28 Nov 2012, 05:17
vomhorizon wrote:
Quote:
Author's argument depends on the fact that even the conventional heat method reaches same 50 D but no germs are killed so microwaves generated in the Microwave is destroying germs.

This is exactly what the ANSWER CHOICE HINGES ON..Anyone who can pick this up from the Question stem (and the choices) will never confuse this answer choice with any other..

Quote:
Im starting to like LSAT CRs

They are quite similar to GMAT CR's just a bit tougher (what makes them BRUTAL is that the LSAT test takers are expected to solve each question in about 80 seconds).. I feel that no prep company quite replicates the subtle variations in answer choices the way the GMAT test makers do, and LSAT CR's are very similar.. I know of quite a few LSAT test takers who start practicing GMAT CR, after they have exhausted the nearly infinite Logical Reasoning questions LSAC puts out

I cannot agree with you more than sir. If we nail each one of these in LAST timings then GMAT CRs are going to be cakewalk, But IMO that would require lots n lots of work put only in verbal. we, unlike LASTer, have to deal with Quants also. I hate those "already GOOD at QUANTs" guys (just kidding "

Cheers
Senior Manager
Joined: 03 Sep 2012
Posts: 338
Location: United States
Concentration: Healthcare, Strategy
GMAT 1: 730 Q48 V42
GPA: 3.88
WE: Medicine and Health (Health Care)
Followers: 16

Kudos [?]: 179 [1] , given: 31

Re: A cup of raw milk, after being heated in a microwave oven... [#permalink]

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28 Nov 2012, 05:36
1
KUDOS
Quote:
I cannot agree with you more than sir. If we nail each one of these in LAST timings then GMAT CRs are going to be cakewalk, But IMO that would require lots n lots of work put only in verbal. we, unlike LASTer, have to deal with Quants also. I hate those "already GOOD at QUANTs" guys (just kidding

I hate them too , but i guess it would not be unreasonable to expect a guy coming from an engineering or business background to find Quant a cake walk. I am a MD, and have not touched quant in almost a decade, so for me it was PAIN in the last 2 months, and i have only reached a 44 on GMAT PREP ( another couple of months to go before i cross 47).. But for people like me Boosting Verbal is another way to take the overall score beyond 700 ( say take V to 40 or beyond, then i would only need Q46 to hit the 700 mark) especially if one finds Verbal concepts not all that challenging.

Today I took three extremely brutal LSAT reasoning sections timed (25 questions per section), and managed to average 39 minutes a section (LSAC gives 35 minutes a section) and my overall accuracy was around 85% (95% for the first 14 questions on each section which many experts consider more realistic GMAT difficulty)..That has done wonders for me, and i think i have improved my CR level after reading the text book for the second time and going up against LSAT sets...I hit LSAT RC's next .. Before hitting the grammar and SC books HARD to boost up my SC (Before i started CR prep i was in the 75th percentile in Verbal) ..
_________________

"When you want to succeed as bad as you want to breathe, then you’ll be successful.” - Eric Thomas

Re: A cup of raw milk, after being heated in a microwave oven...   [#permalink] 28 Nov 2012, 05:36
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