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Many researchers believe that the presence of RNA in brain cells is

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Many researchers believe that the presence of RNA in brain cells is [#permalink]

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New post Updated on: 21 May 2018, 21:35
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59% (01:50) correct 41% (01:42) wrong based on 127 sessions

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Many researchers believe that the presence of RNA in brain cells is the biochemical basis of memory; that is, the presence of RNA enables us to remember. Because certain chemicals are known to inhibit the synthesis of RNA in the body, we can test this hypothesis. Animals that have learned particular responses can be injected with an RNA inhibitor and then tested for memory of the learned responses.

Which of the following test results would most seriously weaken the case for the presence of RNA as the basis of memory?


A. After an injection of RNA inhibitor, a wide range of behaviors in addition to the learned responses were affected.

B. After an injection of RNA inhibitor, animals that had not consistently been giving the learned responses were able to give them consistently.

C. After injections of RNA inhibitor, some animals lost memory of the learned responses totally but others lost it only partially.

D. After a small injection of RNA inhibitor, animals responded well, but as the size of the injection increased, they gave fewer of the learned responses.

E. After an injection of RNA inhibitor, animals could not learn a new response.

Originally posted by inboxsaukar on 18 May 2015, 03:31.
Last edited by Bunuel on 21 May 2018, 21:35, edited 1 time in total.
Renamed the topic, edited the question and added the OA.
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Re: Many researchers believe that the presence of RNA in brain cells is [#permalink]

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New post 19 May 2015, 23:39
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B.
Reasoning: The researchers believe that the presence of RNA enables to remember. However, after an injection of RNA inhibitor, if animals gave learned responses more consistently than before, it would appear that the absence of RNA facilitates memory.
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Re: Many researchers believe that the presence of RNA in brain cells is [#permalink]

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New post 07 Jun 2018, 22:48
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The Official Explanationation was taken from LSAT logic

The researchers believe that the presence of RNA enables us to remember. However, if, after an injection of RNA inhibitor, animals gave learned responses more consistently than before, it would appear that the absence of RNA facilitates memory. Therefore, the correct answer is B.

A is incorrect. These results would suggest that RNA is the basis of other abilities in addition to that of memory, but there is nothing in them that would weaken the case for RNA as the basis of memory. C is not correct. These results support the case that RNA is the basis of memory, although they suggest that the degree of effectiveness of either RNA or RNA inhibitor may vary. D is incorrect. These results would suggest that RNA must be strongly inhibited in order to impair memory, but still support the case for RNA as the basis of memory. The last answer choice is also incorrect. These results would suggest that RNA is necessary for new learning, and as the learning would require memory, the results would support the case for RNA as the basis of memory.
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Re: Many researchers believe that the presence of RNA in brain cells is [#permalink]

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New post 08 Jun 2018, 00:02
So, since we need to weaken the argument which concludes that RNA facilitates the memory, and injecting an RNA inhibitor would lead to memory loss completely or partially, we need to prove that RNA might be cause of weak memory and injection of inhibitors paces up the memory power. Let's analyze the options -

A. After an injection of RNA inhibitor, a wide range of behaviors in addition to the learned responses were affected. - This strengthens the argument.

B. After an injection of RNA inhibitor, animals that had not consistently been giving the learned responses were able to give them consistently. - ok, this point says that after injecting the inhibitor, the learned responses improved. This, what we want. Still, hold on to check other options, may be you find something better.

C. After injections of RNA inhibitor, some animals lost memory of the learned responses totally but others lost it only partially. - This is a weak strengthener of the argument.

D. After a small injection of RNA inhibitor, animals responded well, but as the size of the injection increased, they gave fewer of the learned responses. - Strengthens again.

E. After an injection of RNA inhibitor, animals could not learn a new response. - this option does not talk anything about the past memory or learned behaviors. Thus, OOS.

Thus, now we are left with only B. B is the best option.
Re: Many researchers believe that the presence of RNA in brain cells is   [#permalink] 08 Jun 2018, 00:02
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Many researchers believe that the presence of RNA in brain cells is

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