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# Bacteria that benefit human beings when they are present in the body

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Director
Joined: 30 Jan 2016
Posts: 753
Location: United States (MA)
Bacteria that benefit human beings when they are present in the body  [#permalink]

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16 Nov 2017, 10:23
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Difficulty:

35% (medium)

Question Stats:

76% (01:58) correct 24% (02:16) wrong based on 94 sessions

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Bacteria that benefit human beings when they are present in the body are called commensals. The bacterium Helicobacter pylori plays a primary role in the development of stomach ulcers. But since stomach ulcers occur in less than 10 percent of those harboring H. pylori, and since it allegedly strengthens immune response, many scientists now consider it a commensal. But this is surely misguided. Only about 10 percent of the people who harbor Mycobacter tuberculosis-a bacterium that can cause tuberculosis-get sick from it, yet no one would call M. tuberculosis a commensal.

Which one of the following, if true, most seriously undermines the argument's reasoning?

(A) Stomach ulcers caused by H. pylori and tuberculosis can both be effectively treated with antibiotics.
(B) Cases of tuberculosis usually last longer than ulcers caused by H. pylori.
(C) People who harbor M. tuberculosis derive no benefit from its presence.
(D) There are more people who harbor M. tuberculosis than people who harbor H. pylori.
(E) There are more people who harbor H. pylori than people who harbor M. tuberculosis.

Source: LSAT

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Re: Bacteria that benefit human beings when they are present in the body  [#permalink]

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16 Nov 2017, 10:40
Akela wrote:
Bacteria that benefit human beings when they are present in the body are called commensals. The bacterium Helicobacter pylori plays a primary role in the development of stomach ulcers. But since stomach ulcers occur in less than 10 percent of those harboring H. pylori, and since it allegedly strengthens immune response, many scientists now consider it a commensal. But this is surely misguided. Only about 10 percent of the people who harbor Mycobacter tuberculosis-a bacterium that can cause tuberculosis-get sick from it, yet no one would call M. tuberculosis a commensal.

Which one of the following, if true, most seriously undermines the argument's reasoning?

(A) Stomach ulcers caused by H. pylori and tuberculosis can both be effectively treated with antibiotics.
(B) Cases of tuberculosis usually last longer than ulcers caused by H. pylori.
(C) People who harbor M. tuberculosis derive no benefit from its presence.
(D) There are more people who harbor M. tuberculosis than people who harbor H. pylori.
(E) There are more people who harbor H. pylori than people who harbor M. tuberculosis.

Source: LSAT

lot of scientific jargon , but if one neglect that question is not so tough ..

Commensal virus---helps in immunity
H. pylori--help in immunity , so it is called as commensal.
Mycobacter tuberculosis--only info is : it make 10% ppl sick .with this info argument raises a question that why it is not considered commensal..

Now we need to weaken this ...

C points correctly that there is no benefit from mycobactor , so it should not be consider as commensal
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Joined: 04 Jul 2017
Posts: 8
Re: Bacteria that benefit human beings when they are present in the body  [#permalink]

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16 Nov 2017, 11:20
sobby wrote:
Akela wrote:
Bacteria that benefit human beings when they are present in the body are called commensals. The bacterium Helicobacter pylori plays a primary role in the development of stomach ulcers. But since stomach ulcers occur in less than 10 percent of those harboring H. pylori, and since it allegedly strengthens immune response, many scientists now consider it a commensal. But this is surely misguided. Only about 10 percent of the people who harbor Mycobacter tuberculosis-a bacterium that can cause tuberculosis-get sick from it, yet no one would call M. tuberculosis a commensal.

Which one of the following, if true, most seriously undermines the argument's reasoning?

(A) Stomach ulcers caused by H. pylori and tuberculosis can both be effectively treated with antibiotics.
(B) Cases of tuberculosis usually last longer than ulcers caused by H. pylori.
(C) People who harbor M. tuberculosis derive no benefit from its presence.
(D) There are more people who harbor M. tuberculosis than people who harbor H. pylori.
(E) There are more people who harbor H. pylori than people who harbor M. tuberculosis.

Source: LSAT

lot of scientific jargon , but if one neglect that question is not so tough ..

Commensal virus---helps in immunity
H. pylori--help in immunity , so it is called as commensal.
Mycobacter tuberculosis--only info is : it make 10% ppl sick .with this info argument raises a question that why it is not considered commensal..

Now we need to weaken this ...

C points correctly that there is no benefit from mycobactor , so it should not be consider as commensal

I second this C

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Re: Bacteria that benefit human beings when they are present in the body &nbs [#permalink] 16 Nov 2017, 11:20
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