Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized for You
we will pick new questions that match your level based on your Timer History
Track Your Progress
every week, we’ll send you an estimated GMAT score based on your performance
Practice Pays
we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
It appears that you are browsing the GMAT Club forum unregistered!
Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club
Registration gives you:
Tests
Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.
Applicant Stats
View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more
Books/Downloads
Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!
Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
A cup of raw milk, after being heated in a microwave oven to [#permalink]
Show Tags
28 Nov 2012, 05:09
2
This post was BOOKMARKED
00:00
A
B
C
D
E
Difficulty:
55% (hard)
Question Stats:
61% (01:34) correct
39% (02:05) wrong based on 156 sessions
HideShow timer Statistics
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.
Re: A cup of raw milk, after being heated in a microwave oven to [#permalink]
Show Tags
28 Nov 2012, 05:40
2
This post received 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.
Re: A cup of raw milk, after being heated in a microwave oven to [#permalink]
Show Tags
28 Nov 2012, 05:47
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
Re: A cup of raw milk, after being heated in a microwave oven to [#permalink]
Show Tags
28 Nov 2012, 06:17
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 "
Re: A cup of raw milk, after being heated in a microwave oven to [#permalink]
Show Tags
28 Nov 2012, 06:36
1
This post received 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
Can you please help with analysis of argument and B/ E in detail. Do we not have to prove that destruction of enzymes is due to ANY heat and not necessarily the heat generated by microwave
_________________
Can you please help with analysis of argument and B/ E in detail. Do we not have to prove that destruction of enzymes is due to ANY heat and not necessarily the heat generated by microwave
If we heat milk to 50 degrees C with conventional heat, most of the enzyme will survive. If we heat milk to the same temperature using a microwave, half of the enzyme is destroyed. This seems to imply that the microwaves destroy the enzyme, not the heat.
However, choice (E) tells us that when we use a microwave to heat milk to 50° C, small zones where the temperature is much hotter than 50° C are created. The enzymes in those small zones might be destroyed by the high heat (temperatures much hotter than 50 degrees). Thus, choice (E) suggests that the enzymes are destroyed not by microwaves but by heat much greater than 50° C.
_________________
Need an expert reply? Hit the request verbal experts' reply button -- and please be specific about your question. Feel free to tag @GMATNinja and @GMATNinjaTwo in your post.
We’ve given one of our favorite features a boost! You can now manage your profile photo, or avatar , right on WordPress.com. This avatar, powered by a service...
Sometimes it’s the extra touches that make all the difference; on your website, that’s the photos and video that give your content life. You asked for streamlined access...
A lot has been written recently about the big five technology giants (Microsoft, Google, Amazon, Apple, and Facebook) that dominate the technology sector. There are fears about the...
Post today is short and sweet for my MBA batchmates! We survived Foundations term, and tomorrow's the start of our Term 1! I'm sharing my pre-MBA notes...
61% (01:34) correct
"
, 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. 
