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akela
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Bacteria that benefit human beings when they are present in the body 16 Nov 2017, 10:23
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

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25% (medium)

Question Stats:

80% (01:45) correct 20% (02:25) wrong based on 343 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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Bacteria that benefit human beings when they are present in the body 16 Nov 2017, 10:40
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Akela
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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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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Bacteria that benefit human beings when they are present in the body 16 Nov 2017, 11:20
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sobby
Akela
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
Show more
I second this C

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Bacteria that benefit human beings when they are present in the body 10 Jul 2020, 06:16
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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.

Reasoning: the argument says we should call M. tuberculosis a commensal. So, we need to fin the statement which shows it should not.

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. - IRREVELANT
(B) Cases of tuberculosis usually last longer than ulcers caused by H. pylori. - IRREVELANT
(C) People who harbor M. tuberculosis derive no benefit from its presence. - CORRECT; IT WEAKENS THE CONCLUSION AS COMMENSALS ARE THE ONES THAT BENEFIT HUMANS
(D) There are more people who harbor M. tuberculosis than people who harbor H. pylori. - NO SUCH COMPARISON
(E) There are more people who harbor H. pylori than people who harbor M. tuberculosis. -NO SUCH COMPARISON
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Bacteria that benefit human beings when they are present in the body 21 Jan 2026, 21:43
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