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The milk of many mammals contains cannabinoids, substances

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The milk of many mammals contains cannabinoids, substances [#permalink] New post 14 Oct 2007, 19:03
00:00
A
B
C
D
E

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(N/A)

Question Stats:

70% (02:39) correct 30% (02:06) wrong based on 3 sessions
The milk of many mammals contains cannabinoids, substances that are known to stimulate certain receptors in the brain. To investigate the function of cannabinoids, researchers injected newborn mice with a chemical that is known to block cannabinoides from reaching their receptors in the brain. The injected mice showed far less interest in feeding than normal newborn mice do. Therefore, cannabinoids probably function to stimulate the appetite.

Which of the following is an assumption on which the argument depends?

A. Newborn mice do not normally ingest any substance other than their
mothers’ milk.
B. Cannabinoids are the only substances in mammals’ milk that stimulate the appetite.
C. The mothers of newborn mice do not normally make any effort to encourage their babies to feed.
D. The milk of mammals would be less nutritious if it did not contain cannabinoids.
E. The chemical that blocks cannabinoids from stimulating their brain receptors does not independently inhibit the appetite.
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 [#permalink] New post 14 Oct 2007, 19:05
Assumption: "feeding" involves receptor action so B follows
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Re: CR - SET 24 Q34 [#permalink] New post 14 Oct 2007, 19:14
singh_amit19 wrote:
The milk of many mammals contains cannabinoids, substances that are known to stimulate certain receptors in the brain. To investigate the function of cannabinoids, researchers injected newborn mice with a chemical that is known to block cannabinoides from reaching their receptors in the brain. The injected mice showed far less interest in feeding than normal newborn mice do. Therefore, cannabinoids probably function to stimulate the appetite.

Which of the following is an assumption on which the argument depends?

A. Newborn mice do not normally ingest any substance other than their
mothers’ milk.
B. Cannabinoids are the only substances in mammals’ milk that stimulate the appetite.
C. The mothers of newborn mice do not normally make any effort to encourage their babies to feed.
D. The milk of mammals would be less nutritious if it did not contain cannabinoids.
E. The chemical that blocks cannabinoids from stimulating their brain receptors does not independently inhibit the appetite.


this was between B and E but i think E is a stronger assumption. it could be that the chemicals they injected caused the mice's appetites to decrease and not the absence of cannabinoids
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Re: CR - SET 24 Q34 [#permalink] New post 14 Oct 2007, 19:22
beckee529 wrote:
singh_amit19 wrote:
The milk of many mammals contains cannabinoids, substances that are known to stimulate certain receptors in the brain. To investigate the function of cannabinoids, researchers injected newborn mice with a chemical that is known to block cannabinoides from reaching their receptors in the brain. The injected mice showed far less interest in feeding than normal newborn mice do. Therefore, cannabinoids probably function to stimulate the appetite.

Which of the following is an assumption on which the argument depends?

A. Newborn mice do not normally ingest any substance other than their
mothers’ milk.
B. Cannabinoids are the only substances in mammals’ milk that stimulate the appetite.
C. The mothers of newborn mice do not normally make any effort to encourage their babies to feed.
D. The milk of mammals would be less nutritious if it did not contain cannabinoids.
E. The chemical that blocks cannabinoids from stimulating their brain receptors does not independently inhibit the appetite.


this was between B and E but i think E is a stronger assumption. it could be that the chemicals they injected caused the mice's appetites to decrease and not the absence of cannabinoids


You are correct OA is E....please explain a little more on E!
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Re: CR - SET 24 Q34 [#permalink] New post 14 Oct 2007, 21:19
singh_amit19 wrote:
The milk of many mammals contains cannabinoids, substances that are known to stimulate certain receptors in the brain. To investigate the function of cannabinoids, researchers injected newborn mice with a chemical that is known to block cannabinoides from reaching their receptors in the brain. The injected mice showed far less interest in feeding than normal newborn mice do. Therefore, cannabinoids probably function to stimulate the appetite.

Which of the following is an assumption on which the argument depends?

A. Newborn mice do not normally ingest any substance other than their
mothers’ milk.
B. Cannabinoids are the only substances in mammals’ milk that stimulate the appetite.
C. The mothers of newborn mice do not normally make any effort to encourage their babies to feed.
D. The milk of mammals would be less nutritious if it did not contain cannabinoids.
E. The chemical that blocks cannabinoids from stimulating their brain receptors does not independently inhibit the appetite.


E.

The only variables that were different between the control group "normal newborn mice" and "injected newborn mice" was the chemical and the cannabinoids. Since we're testing for the latter, if we can fault the chemical, then the experiment is not valid.

B is not as strong because say, for instance, the chemical caused them to have only 10% of the energy they normally would have. This would not be a direct change in their appetite, but they may show low-appetite behavior.
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 [#permalink] New post 14 Oct 2007, 22:17
The chemical that blocks cannabinoids from stimulating their brain receptors "does not independently inhibit the appetite"
can u pls clarify on this
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 [#permalink] New post 15 Oct 2007, 06:52
ajay85 wrote:
The chemical that blocks cannabinoids from stimulating their brain receptors "does not independently inhibit the appetite"
can u pls clarify on this


Means it does not of its own accord (meaning by its own presence) inhibit appetite instead of indirectly inhibiting apetite by blocking canabinoids as mentioned in the passage.
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Re: CR - SET 24 Q34 [#permalink] New post 22 Oct 2007, 06:30
singh_amit19 wrote:
The milk of many mammals contains cannabinoids, substances that are known to stimulate certain receptors in the brain. To investigate the function of cannabinoids, researchers injected newborn mice with a chemical that is known to block cannabinoides from reaching their receptors in the brain. The injected mice showed far less interest in feeding than normal newborn mice do. Therefore, cannabinoids probably function to stimulate the appetite.

Which of the following is an assumption on which the argument depends?

A. Newborn mice do not normally ingest any substance other than their
mothers’ milk.
B. Cannabinoids are the only substances in mammals’ milk that stimulate the appetite.
C. The mothers of newborn mice do not normally make any effort to encourage their babies to feed.
D. The milk of mammals would be less nutritious if it did not contain cannabinoids.
E. The chemical that blocks cannabinoids from stimulating their brain receptors does not independently inhibit the appetite.



Its E....A--->B ..you have to make sure that there is no C --->B

or in simpler words there is no other alternative paths to the conclusion
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Re: CR - SET 24 Q34 [#permalink] New post 22 Oct 2007, 17:51
singh_amit19 wrote:
The milk of many mammals contains cannabinoids, substances that are known to stimulate certain receptors in the brain. To investigate the function of cannabinoids, researchers injected newborn mice with a chemical that is known to block cannabinoides from reaching their receptors in the brain. The injected mice showed far less interest in feeding than normal newborn mice do. Therefore, cannabinoids probably function to stimulate the appetite.

Which of the following is an assumption on which the argument depends?

A. Newborn mice do not normally ingest any substance other than their
mothers’ milk.
B. Cannabinoids are the only substances in mammals’ milk that stimulate the appetite.
C. The mothers of newborn mice do not normally make any effort to encourage their babies to feed.
D. The milk of mammals would be less nutritious if it did not contain cannabinoids.
E. The chemical that blocks cannabinoids from stimulating their brain receptors does not independently inhibit the appetite.


E.

A: this was my contendor til I read E. But its weak.
B: this assumption is too extreme.
C: irrelevant
D: Irrelevant

E suggests that possibly the chemical was the cause. If this were the case the argument would be weakend. So E it is.
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 [#permalink] New post 22 Oct 2007, 18:30
agree with E.

If the chemical blocks appetite that it does not matter if it blocks cannabinoids.
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Re: The milk of many mammals contains cannabinoids, substances [#permalink] New post 26 Apr 2014, 20:00
My explanation:

E

Scenario
Two Groups of Mice
Group 1: the control group and had no chemical blocking cannabinoids.
Group 2: Had the chemical.

Result
Group 2 showed less interest in eating therefore cannabinoids function is stimulating appetite.

Negation of E: However, what if the chemical used in blocking cannabinoids by itself blocked the appetite? Then, this invalidates the experiment and thus the argument, and we can't say that cannabinoids stimulates appetite, because the chemical would be the one responsible for blocking the appetite.

Moderators, please change the OA to E according to Stacey's reply here: http://www.manhattangmat.com/forums/cr- ... -t682.html.
Re: The milk of many mammals contains cannabinoids, substances   [#permalink] 26 Apr 2014, 20:00
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