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QOTD #21 People whose bodies cannot produce the substance cytochrome

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QOTD #21 People whose bodies cannot produce the substance cytochrome [#permalink]

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New post 07 Dec 2017, 09:33
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People whose bodies cannot produce the substance cytochrome P450 are three times as likely to develop Parkinson's disease, a disease that affects the brain, as are people whose bodies do produce this substance. Since cytochrome P450 protects the brain from toxic chemicals, toxic chemicals probably play a role in the development of Parkinson's disease.

Which of the following, if true, most strongly supports the argument?

(A)It will soon be possible for cytochrome P450 to be synthesized for the treatment of people whose bodies cannot produce this substance.
(B)Many people whose bodies are unable to produce cytochrome P450 lack the ability to produce certain other substances as well.
(C)Cytochrome P450 has no effect on the brain other than to protect it from toxic chemicals.
(D)People with Parkinson's disease often exhibit a marked lessening in the severity of their symp- toms when they are treated with dopamine, a chemical produced naturally in the brain.
(E)Many people with Parkinson's disease have the ability to produce cytochrome P450 naturally.
[Reveal] Spoiler: OA

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QOTD #21 People whose bodies cannot produce the substance cytochrome [#permalink]

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New post 27 Dec 2017, 22:38
People whose bodies cannot produce the substance cytochrome P450 are three times as likely to develop Parkinson's disease, a disease that affects the brain, as are people whose bodies do produce this substance. Since cytochrome P450 protects the brain from toxic chemicals, toxic chemicals probably play a role in the development of Parkinson's disease.

Which of the following, if true, most strongly supports the argument

(A)It will soon be possible for cytochrome P450 to be synthesised for the treatment of people whose bodies cannot produce this substance. We do not have any suggestion of this in the passage.

(B)Many people whose bodies are unable to produce cytochrome P450 lack the ability to produce certain other substances as well. There is no mention of any other substance in the stimulus besides P450

(C)Cytochrome P450 has no effect on the brain other than to protect it from toxic chemicals. Clearly the logic implies that Parkinson's is PROBABLY caused due to the lack of protection from toxic chemicals and stating that the absence of P450 from the brain allows toxic chemicals to affect it means that the primary function of P450 to protect against toxins and therefore is strengthening the conclusion that toxins play a role in the development of Parkinson's.

(D)People with Parkinson's disease often exhibit a marked lessening in the severity of their symp- toms when they are treated with dopamine, a chemical produced naturally in the brain. There is no connection between P450 and dopamine displayed in the passage.

(E)Many people with Parkinson's disease have the ability to produce cytochrome P450 naturally. We already know this from the passage, a strengthening statement is usually not repeated in the passage.

I hope the logic I've applied is accurate, please correct me if wrong.

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QOTD #21 People whose bodies cannot produce the substance cytochrome [#permalink]

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New post 28 Dec 2017, 00:52
carcass wrote:


People whose bodies cannot produce the substance cytochrome P450 are three times as likely to develop Parkinson's disease, a disease that affects the brain, as are people whose bodies do produce this substance. Since cytochrome P450 protects the brain from toxic chemicals, toxic chemicals probably play a role in the development of Parkinson's disease.

Which of the following, if true, most strongly supports the argument?

(A)It will soon be possible for cytochrome P450 to be synthesized for the treatment of people whose bodies cannot produce this substance.
(B)Many people whose bodies are unable to produce cytochrome P450 lack the ability to produce certain other substances as well.
(C)Cytochrome P450 has no effect on the brain other than to protect it from toxic chemicals.
(D)People with Parkinson's disease often exhibit a marked lessening in the severity of their symp- toms when they are treated with dopamine, a chemical produced naturally in the brain.
(E)Many people with Parkinson's disease have the ability to produce cytochrome P450 naturally.


Suppose the bacteria of Parkinson's disease are killed by XYZ hormone. That imples people without Parkinson disease have the XYZ hormone.
Suppose XYZ hormone is triggered as a side effect by Cytochrome P450.
But as per the premise ,we know that Cytochrome P450 protects from toxic chemicals. However, in this case, toxic chemicals have nothing to do with the Parkinson disease.

So the author's conclusion "toxic chemicals probably play a role in the development of Parkinson's disease. " is weakened in this case.

C eliminates the possibility of such cases by stating that Cytochrome P450 has no effect on the brain (no triggering of XYZ hormone is possible) other than to protect it from toxic chemicals.

--C--
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QOTD #21 People whose bodies cannot produce the substance cytochrome   [#permalink] 28 Dec 2017, 00:52
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