Pls share ur logic, thanks. Q32: Macrophages are cells that : GMAT Critical Reasoning (CR)
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Pls share ur logic, thanks. Q32: Macrophages are cells that

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Pls share ur logic, thanks. Q32: Macrophages are cells that [#permalink]

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04 Jun 2007, 08:21
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Pls share ur logic, thanks.
Q32:
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 mouse’s body decreases.
E.Injections of nitrates into mice that lack macrophages will not enhance the ability of these animals’ immune systems to fight off infection.
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04 Jun 2007, 09:47
It's B
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04 Jun 2007, 09:57
I like C here. B is a shade out of scope
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04 Jun 2007, 13:46
We are looking for a reason for the elevated levels of nitrates in the conclusion, hence I think C is the answer.

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04 Jun 2007, 14:55
jet1445 wrote:
Pls share ur logic, thanks.
Q32:
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.

Does not seem so as macrophages play a role in the response of the immune system to invasive organisms such as bacteria.

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

My choice as answer as immune system is active.

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.

No where has it been mentioned about inhibiting 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 mouse’s body decreases.

It has not been mentioned that the no. of macrophages decreases if the mouse is infected.

E.Injections of nitrates into mice that lack macrophages will not enhance the ability of these animals’ immune systems to fight off infection.

out of scope
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04 Jun 2007, 20:28
Another C
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05 Jun 2007, 03:59
vote for C
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05 Jun 2007, 08:36
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05 Jun 2007, 08:39
I vote for 'C' but whats the OA ?

jet1445 wrote:
Pls share ur logic, thanks.
Q32:
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 mouse’s body decreases.
E.Injections of nitrates into mice that lack macrophages will not enhance the ability of these animals’ immune systems to fight off infection.
Re: CR   [#permalink] 05 Jun 2007, 08:39
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