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Microbiologist: Because heavy metals are normally concentrated in

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Microbiologist: Because heavy metals are normally concentrated in [#permalink]

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New post 24 Aug 2017, 10:54
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Difficulty:

  75% (hard)

Question Stats:

55% (01:19) correct 45% (01:45) wrong based on 74 sessions

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Microbiologist: Because heavy metals are normally concentrated in sewage sludge during the sewage treatment process, the bacteria that survive in the sludge have evolved the unusual ability to resist heavy-metal poisoning. The same bacteria also show a strong resistance to antibiotics. This suggests that the bacteria’s exposure to the heavy metals in the sewage sludge has somehow promoted their resistance to antibiotics.

Which one of the following, if true, most strengthens the microbiologist’s argument?

(A) Most bacteria that are not resistant to antibiotics are not resistant to heavy-metal poisoning either.
(B) Bacteria that live in sewage sludge that is free of heavy metals, but is in other respects similar to normal sewage, are generally resistant to neither heavy-metal poisoning nor antibiotics.
(C) Antibiotic resistance of bacteria that survive in sewage sludge in which heavy metals are concentrated contributes to their resistance to heavy-metal poisoning.
(D) Sewage sludge that contains high concentrations of heavy metals almost always contains significant concentrations of antibiotics.
(E) Many kinds of bacteria that do not live in sewage sludge are resistant to both heavy-metal poisoning and antibiotics.

LSAT
[Reveal] Spoiler: OA

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Re: Microbiologist: Because heavy metals are normally concentrated in [#permalink]

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New post 24 Aug 2017, 11:07
2.48 minutes!! Still too slow... although picked the correct one. :)
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Re: Microbiologist: Because heavy metals are normally concentrated in [#permalink]

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New post 24 Aug 2017, 11:49
+1 for B. The others don't strongly indicate a "causal relationship" between the presence of metals and antibiotics. Only B does so. It does so by eliminating the possibility of the effect occuring without the occurence of the cause.

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Re: Microbiologist: Because heavy metals are normally concentrated in [#permalink]

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New post 25 Aug 2017, 04:08
Masshole wrote:
Microbiologist: Because heavy metals are normally concentrated in sewage sludge during the sewage treatment process, the bacteria that survive in the sludge have evolved the unusual ability to resist heavy-metal poisoning. The same bacteria also show a strong resistance to antibiotics. This suggests that the bacteria’s exposure to the heavy metals in the sewage sludge has somehow promoted their resistance to antibiotics.

Which one of the following, if true, most strengthens the microbiologist’s argument?

(A) Most bacteria that are not resistant to antibiotics are not resistant to heavy-metal poisoning either.
(B) Bacteria that live in sewage sludge that is free of heavy metals, but is in other respects similar to normal sewage, are generally resistant to neither heavy-metal poisoning nor antibiotics.
(C) Antibiotic resistance of bacteria that survive in sewage sludge in which heavy metals are concentrated contributes to their resistance to heavy-metal poisoning.
(D) Sewage sludge that contains high concentrations of heavy metals almost always contains significant concentrations of antibiotics.
(E) Many kinds of bacteria that do not live in sewage sludge are resistant to both heavy-metal poisoning and antibiotics.

LSAT



+1 For B. Bacterial exposed to heavy metals>resistant to antibiotics. B says-Bacteria not exposed to heavy metals>not resistant to antibiotics.

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Re: Microbiologist: Because heavy metals are normally concentrated in   [#permalink] 25 Aug 2017, 04:08
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Microbiologist: Because heavy metals are normally concentrated in

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