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It is often difficult to differentiate between different enantiomers,

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It is often difficult to differentiate between different enantiomers,  [#permalink]

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New post 19 Jul 2018, 20:29
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Which of the following most logically completes the argument?

It is often difficult to differentiate between different enantiomers, molecules with the same chemical formula that are mirror images of one another, with traditional tests. Since enantiomers of certain types of drugs can cause major health problems, some drug manufacturers have created processes that ensure that only the correct form of the drug is produced in order to avoid exposing consumers to harmful enantiomers. However, while such processes do prevent harmful enantiomers from being created during the drug creation process, these processes do not prevent harm from some drug enantiomers since _____.


A. the metabolism of some drugs within the body can create harmful enantiomers regardless of whether the drug itself contains those enantiomers.

B. not all drug enantiomers are harmful and some can even be helpful in fighting certain diseases.

C. many enantiomers only cause minor side effects rather than major health problems when ingested.

D. the creation of harmful enantiomers are not the only side effect that drug manufacturers should seek to reduce.

E. enantiomers are difficult to detect and cannot be pinpointed as the cause of some health problems.

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Re: It is often difficult to differentiate between different enantiomers,  [#permalink]

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New post 19 Jul 2018, 21:16
Which of the following most logically completes the argument?

It is often difficult to differentiate between different enantiomers, molecules with the same chemical formula that are mirror images of one another, with traditional tests. Since enantiomers of certain types of drugs can cause major health problems, some drug manufacturers have created processes that ensure that only the correct form of the drug is produced in order to avoid exposing consumers to harmful enantiomers. However, while such processes do prevent harmful enantiomers from being created during the drug creation process, these processes do not prevent harm from some drug enantiomers since _____.


A. the metabolism of some drugs within the body can create harmful enantiomers regardless of whether the drug itself contains those enantiomers. - Correct - though the drug itself is not an enantiomer but its' metabolism can create harmful enantiomers

B. not all drug enantiomers are harmful and some can even be helpful in fighting certain diseases. -- Incorrect - we need to explain how inspite of harmful enantiomers not being created in drug creation process, these processes DONOT preven harm from some drug enantiomers

C. many enantiomers only cause minor side effects rather than major health problems when ingested. -- Irrelevant

D. the creation of harmful enantiomers are not the only side effect that drug manufacturers should seek to reduce. -- Incorrect

E. enantiomers are difficult to detect and cannot be pinpointed as the cause of some health problems. -- Incorrect

Answer A
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It is often difficult to differentiate between different enantiomers,  [#permalink]

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New post 19 Jul 2018, 21:30
Bunuel wrote:
Which of the following most logically completes the argument?

It is often difficult to differentiate between different enantiomers, molecules with the same chemical formula that are mirror images of one another, with traditional tests. Since enantiomers of certain types of drugs can cause major health problems, some drug manufacturers have created processes that ensure that only the correct form of the drug is produced in order to avoid exposing consumers to harmful enantiomers. However, while such processes do prevent harmful enantiomers from being created during the drug creation process, these processes do not prevent harm from some drug enantiomers since _____.


A. the metabolism of some drugs within the body can create harmful enantiomers regardless of whether the drug itself contains those enantiomers.

B. not all drug enantiomers are harmful and some can even be helpful in fighting certain diseases.

C. many enantiomers only cause minor side effects rather than major health problems when ingested.

D. the creation of harmful enantiomers are not the only side effect that drug manufacturers should seek to reduce.

E. enantiomers are difficult to detect and cannot be pinpointed as the cause of some health problems.


The Conclusion here is that Drug Companies have created processes which enable them to isolate the required enantiomers only, so unwanted enantiomers are removed., yet the Drug companies claim some harm due to enantiomers may occur, which means enantiomers are formed by virtue of body's metabolism, on which the drug companies have no control. Option A explains the reason why
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Re: It is often difficult to differentiate between different enantiomers,  [#permalink]

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New post 22 Jul 2018, 08:24
Bunuel wrote:
Which of the following most logically completes the argument?

It is often difficult to differentiate between different enantiomers, molecules with the same chemical formula that are mirror images of one another, with traditional tests. Since enantiomers of certain types of drugs can cause major health problems, some drug manufacturers have created processes that ensure that only the correct form of the drug is produced in order to avoid exposing consumers to harmful enantiomers. However, while such processes do prevent harmful enantiomers from being created during the drug creation process, these processes do not prevent harm from some drug enantiomers since _____.


A. the metabolism of some drugs within the body can create harmful enantiomers regardless of whether the drug itself contains those enantiomers.

B. not all drug enantiomers are harmful and some can even be helpful in fighting certain diseases.

C. many enantiomers only cause minor side effects rather than major health problems when ingested.

D. the creation of harmful enantiomers are not the only side effect that drug manufacturers should seek to reduce.

E. enantiomers are difficult to detect and cannot be pinpointed as the cause of some health problems.


VERITAS PREP OFFICIAL SOLUTION:



Whenever you are asked for an answer that "most logically completes" an argument, you can determine what type of question you're dealing with by looking immediately before the blank that the answer will fill in. Here that blank is preceded by "since," so you're looking for a reason, and before that it's "these processes do not prevent harm from some drug enantiomers." So you're looking to provide a reason that these processes don't prevent harm - you're looking to strengthen that idea.

In any strengthen/weaken problem it is extremely helpful to notice the gap in logic between the premises and conclusion, and here the "extra" information just before the conclusion gives you great insight into that. Notice the modifier "during the drug creation process" - that gives a good deal of specificity as to where the prevention of harm takes place. It limits the prevention of enantiomers to that narrow scope "during the drug creation process," leaving enantiomers to emerge during any other time period (during transport of the drugs, the drugs' interaction with their containers, when taken in combination with other drugs or foods, etc.). If you notice that, you can scan the answer choices looking for some other timeframe when these enantiomers emerge.

Choice (A) gives you exactly such a situation where this could happen. If the metabolism of the drugs leads to the creation of the harmful enantiomers, then there is no way that changes in the production process can mitigate the effects of harmful enantiomers. Choice (A) exploits that gap in logic and is correct.

Among the other answers, choice (B) can be eliminated because the argument is about exposure to harmful enantiomers, not whether all enantiomers are necessarily bad. Choice (C) can be eliminated because the argument is about limiting consumer exposure to all harmful enantiomers regardless of severity. Choice (D) can be eliminated because the argument is only about enantiomers, not other side effects, and choice (E) can be eliminated because it does not deal with whether it is possible to limit consumer exposure to harmful enantiomers.
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New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Re: It is often difficult to differentiate between different enantiomers, &nbs [#permalink] 22 Jul 2018, 08:24
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