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# Macrophages are cells that play a role in the response of

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Macrophages are cells that play a role in the response of [#permalink]

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06 Nov 2005, 12:45
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Macrophages are cells that play a role in the response of the immune system of mice and other mammals to invasive organisms such as bacteria. Unlike other mice, mice that are genetically incapable of making these particular cells do not show elevated levels of nitrates when infected with bacteria.

The statements above, if true, provide the most support for which of the following conclusions?

A. Mice that are unable either to make macrophages or to make them in sufficient numbers will protect themselves from bacterial infections in some other way.
B. Mice that show elevated levels of nitrates can easily fight off most types of bacterial infections.
C. In mice, macrophages play a role in the production of nitrates or inhibit a process by which nitrates are broken down or otherwise eliminated.
D. When a healthy mouse becomes infected with an invasive organism, the number of macrophages in the mouseâ€™s body decreases.
E. Injections of nitrates into mice that lack macrophages will not enhance the ability of these animalsâ€™ immune systems to fight off infection.
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07 Nov 2005, 07:36
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I eliminated B because it was too extreme :

B. Mice that show elevated levels of nitrates can easily fight off most types of bacterial infections.
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Antoine

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06 Nov 2005, 12:55
I strongly support C.

In Mice: bacteria lead to elevated levels of nitrates. bacteria activate macrophages. To close this circle a connection between macrophage and nitrates must exist which is answer C
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06 Nov 2005, 22:57
sandalphon wrote:
I strongly support C.

In Mice: bacteria lead to elevated levels of nitrates. bacteria activate macrophages. To close this circle a connection between macrophage and nitrates must exist which is answer C

TRUE, TRUE !
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07 Nov 2005, 00:06
I vote for C

A,B,D, E - Infer too much and bring in data which is out of scope.
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07 Nov 2005, 01:43
One more vote for C
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07 Nov 2005, 01:51
C too
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07 Nov 2005, 05:25
Good job guys. C is the OA.

I was stuck between B and C. I understand that C is correct, but how do u eliminate B.
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07 Nov 2005, 05:38
nakib77 wrote:
Good job guys. C is the OA.

I was stuck between B and C. I understand that C is correct, but how do u eliminate B.

The author says that macrophages are good against invasive organisms such as bacteria, and (B) says that macrophages are good against MOST TYPES OF BACTERIAL INFECTIONS.

We do not know if it is good against MOST bacteria.
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07 Nov 2005, 06:13
nakib77 wrote:
Good job guys. C is the OA.

I was stuck between B and C. I understand that C is correct, but how do u eliminate B.

I think we must differentiate here between "show a response" and "easily fight off". These two things are not similar.
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07 Nov 2005, 13:36
All except C are irrelevant or out of scope. therefore C must be.
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Re: Macrophages are cells that play a role in the response of [#permalink]

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03 Aug 2014, 06:07
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
Re: Macrophages are cells that play a role in the response of   [#permalink] 03 Aug 2014, 06:07
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