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Scientific advances in the latter half of the twentieth

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Intern
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Re: Scientific advances in the latter half of the twentieth [#permalink] New post 27 May 2014, 00:01
Got all right and it took aroun 5-6minutes.

And it's a bit late but if this is helpful to any future students:
In Q 1, A is not right because the sentence (The research thus far is promising but inconclusive; future scientific advances should allow this theory to be tested more rigorously) that people are referring to actually means the whole research and not the research of the drug only.
In Q3, B is wrong beause the question is what would MOST hinder, not what would hinder. The right answer (D) would be the one that hinders the theory most.

:)
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Re: Scientific advances in the latter half of the twentieth [#permalink] New post 09 Jun 2014, 04:12
Explanation for #3:

"(D) Some semi-synthetic hallucinogenic drugs other than LSD do not inhibit serotonin."

It may seem Out of Scope at first -- why would we bring in some other drug in the "argument." Tricky as it is, the answer choice actually implies that there are other hallucinogenic drugs other than LSD that still perform their main function--make one hallucinate--despite its inability to inhibit serotonin (unlike LSD).

Hence, if it is true that there are other drugs that make people hallucinate without inhibiting serotonin, then the whole argument of the author collapses since his underlying premise is that the inhibition of serotonin is a necessary condition.
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Re: Scientific advances in the latter half of the twentieth [#permalink] New post 11 Jun 2014, 05:08
Can anyone explain this phrase?

"LSD mimics serotonin well enough to be able to bind at most of the neurotransmitter’s receptor sites"

Is LSD binding neurotransmitter or...?
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Re: Scientific advances in the latter half of the twentieth [#permalink] New post 11 Jun 2014, 06:33
pretzel wrote:
Can anyone explain this phrase?

"LSD mimics serotonin well enough to be able to bind at most of the neurotransmitter’s receptor sites"

Is LSD binding neurotransmitter or...?


In other words, the function of LSD is to act as a "fake" serotonin thereby blocking the so-called "receptor sites." Because of this, the "real" serotonin neurotransmitters are prevented from going to their receptor sites and consequently preventing them from functioning normally.
Re: Scientific advances in the latter half of the twentieth   [#permalink] 11 Jun 2014, 06:33
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