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

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Director
Joined: 29 Oct 2004
Posts: 847

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

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24 Feb 2005, 11:06
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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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Director
Joined: 03 Nov 2004
Posts: 848

Kudos [?]: 58 [0], given: 0

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24 Feb 2005, 11:25
I will go with 'B'
I was also between 'B' & 'C' but I eliminated 'C' because the 'or' part is not mentioned in the passage

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VP
Joined: 18 Nov 2004
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24 Feb 2005, 12:32
I will go with 'B'
I was also between 'B' & 'C' but I eliminated 'C' because the 'or' part is not mentioned in the passage

But how do u know that elevated levels of "nitrate" only by iteself can fight bacteria, others factors may be involved also. I think the only thing we can conclude is that the cells cause the nitrate levels to rise, either by production of the same or inhibit the nitrate level to go down.

Kudos [?]: 49 [0], given: 0

Director
Joined: 03 Nov 2004
Posts: 848

Kudos [?]: 58 [0], given: 0

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24 Feb 2005, 13:54
banerjeea_98 wrote:
I will go with 'B'
I was also between 'B' & 'C' but I eliminated 'C' because the 'or' part is not mentioned in the passage

But how do u know that elevated levels of "nitrate" only by iteself can fight bacteria, others factors may be involved also. I think the only thing we can conclude is that the cells cause the nitrate levels to rise, either by production of the same or inhibit the nitrate level to go down.

Re-reading it I find 'C' to be more appropriate, the 2 'or' threw me off the first time around.

Kudos [?]: 58 [0], given: 0

24 Feb 2005, 13:54
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# Macrophages are cells that play a role in the response of

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