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# The milk of many mammals contains cannabinoids, substances

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Manager
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The milk of many mammals contains cannabinoids, substances [#permalink]

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11 Feb 2008, 11:38
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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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Senior Manager
Joined: 06 Jul 2006
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Location: SFO Bay Area
Schools: Berkeley Haas
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Re: CR - Receptors in the brain [#permalink]

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11 Feb 2008, 17:07
E is the most reasonable assumption...Whats the OA ?
CEO
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Re: CR - Receptors in the brain [#permalink]

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11 Feb 2008, 17:34
JCLEONES 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.

Clear E.
Director
Joined: 14 Jan 2007
Posts: 776
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Re: CR - Receptors in the brain [#permalink]

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11 Feb 2008, 17:38
E is the clear winner.
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Kudos [?]: 160 [0], given: 0

Re: CR - Receptors in the brain [#permalink]

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15 Feb 2008, 08:20
Conclusion: The milk of many mammals contains cannabinoids, substances that are known to stimulate certain receptors in the brain.

A. Newborn mice do not normally ingest any substance other than their
mothers’ milk. [Fine – but does not provide any support to conclusion – eliminate it]
B. Cannabinoids are the only substances in mammals’ milk that stimulate the
appetite. [Too extreme “only” – eliminate it]
C. The mothers of newborn mice do not normally make any effort to encourage their
babies to feed.[What mothers of new born does is out of scope – eliminate it]
D. The milk of mammals would be less nutritious if it did not contain cannabinoids. [What makes nutritious is out of scope – eliminate it]
E. The chemical that blocks cannabinoids from stimulating their brain receptors does
not independently inhibit the appetite. [Hold it]

Re: CR - Receptors in the brain   [#permalink] 15 Feb 2008, 08:20
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