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The gill lining of lobsters in which the disease-causing parasite

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The gill lining of lobsters in which the disease-causing parasite  [#permalink]

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New post Updated on: 24 Sep 2018, 03:22
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The gill lining of lobsters in which the disease-causing parasite An. haemophila resides is completely regenerated every 30 days. The An. haemophila parasite typically produces moderate discoloration of the gills of infected lobsters, and can occasionally lead to more chronic symptoms. However, because these parasites cannot transfer directly from infected gill lining to newly generated gill lining in their host lobster, any discoloration appearing on the gills of lobsters more than 30 days after they have been moved to parasite-free water is not due to infection by An. haemophila.

Which of the following, if true, would most weaken the argument above?


(A) Other parasites are found more frequently in lobsters than An. haemophila.

(B) Lobsters that remain in parasite-rich waters can be re-infected by new An. haemophila parasites once newly generated gill lining has been produced.

(C) An. haemophila can also cause digestive and respiratory distress in infected lobsters.

(D) In some cases An. haemophila migrates from the gill lining to the stomach, where it can then re-infect its original host.

(E) Once infected by a particular parasite, lobsters frequently develop a strong immunity to that parasite allowing them to better resist re-infection.

Originally posted by JS1290 on 05 Aug 2017, 17:29.
Last edited by Bunuel on 24 Sep 2018, 03:22, edited 1 time in total.
Renamed the topic and edited the question.
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Re: The gill lining of lobsters in which the disease-causing parasite  [#permalink]

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New post 07 Aug 2017, 11:09
I was between B and D and chose B. Can someone explain why B is wrong?
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Re: The gill lining of lobsters in which the disease-causing parasite  [#permalink]

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New post 07 Aug 2017, 13:46
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pra1785 wrote:
I was between B and D and chose B. Can someone explain why B is wrong?


The passage is concerned about lobsters that move in parasite free waters. Lobsters that stay back in parasite rich waters are out of scope. So B is wrong. To Weaken the passage we need something that would reinfect lobster. Option D just does that.
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Re: The gill lining of lobsters in which the disease-causing parasite  [#permalink]

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New post 12 Jan 2019, 20:00
What is the source of this question?
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Re: The gill lining of lobsters in which the disease-causing parasite  [#permalink]

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New post 31 Mar 2019, 03:33
Which of the following, if true, would most weaken the argument above?
(A) Other parasites are found more frequently in lobsters than An. haemophila.
(B) Lobsters that remain in parasite-rich waters can be re-infected by new An. haemophila parasites once newly generated gill lining has been produced.
(C) An. haemophila can also cause digestive and respiratory distress in infected lobsters.
(D) In some cases An. haemophila migrates from the gill lining to the stomach, where it can then re-infect its original host.
(E) Once infected by a particular parasite, lobsters frequently develop a strong immunity to that parasite allowing them to better resist re-infection.

Conclusion: Any discolouration appearing on gills after 30 days of the lobsters residing in parasite-free water is not due to [X]
P1: Gill lining regens every 30 days
P2: Parasites cannot transfer from infected gill to newly regenerated gill

Therefore:
A - Irrelevant
B - Irrelevant to scope of argument as we are only concerned with lobsters that have been transferred to parasite free water
C - Again, irrelevant to argument
D - Provides an alternate cause for reinfection and shows that the stated effect can actually be caused by something else -->Correct
E - Immunity is completely irrelevant to the argument.
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The gill lining of lobsters in which the disease-causing parasite  [#permalink]

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New post 01 Apr 2019, 04:43
philipssonicare wrote:
What is the source of this question?

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This is a challenging Weaken question with a scientific undertone. As with any
stimulus containing argumentation, it becomes imperative that you identify the
conclusion as given by the author. Here, the author concludes that lobsters’ gill
discoloration appearing more than 30 days after begin removed from water with
parasites cannot be due to An. haemophila. The reasoning given for this conclusion is
that the gill-discoloring parasite An. haemophila resides in gill lining which is
completely regenerated every 30 days and, since these parasites cannot go directly
from infected gill lining to new, regenerated gill lining, then future gill discoloration
must be the result of something else. Put more simply: An. haemophila cannot go
directly from old to new gill lining, so it seems that continued gill infections must be
caused by some other factor.
Since we want to weaken this causal argument, we are looking for an answer choice
that shows how An. haemophila could possibly re-infect a lobster and cause further
gill discoloration.
Answer choice (A): The argument in the stimulus is not about other parasites or how
frequently various parasites are found in lobsters, so this answer choice has no effect
on the author’s conclusion.
Answer choice (B): For an answer choice to weaken a particular argument it is
important that the scenario or situation described in the answer match the specific
details of the situation in the argument itself. This answer is incorrect because the
lobsters in the conclusion are said to be in parasite-free water, so information about
lobsters in “parasite-rich” water is irrelevant.
Answer choice (C): The stimulus is only concerned with An. haemophila’s effect on
the gill lining of lobsters, so information about other problems the parasite can cause
has no bearing on the argument.
Answer choice (D): This is the correct answer. The author presumes that because the
parasite cannot re-infect a host lobster by directly moving from the infected gill
lining to the newly generated gill lining then An. haemophila cannot be the cause of
future gill discoloration. However, if answer choice (D) is true, then An. haemophila
can migrate from infected gill lining to the lobster’s stomach, and then later re-infect
that lobster’s regenerated gill lining. This answer choice provides an alternative
pathway for re-infection and thereby directly attacks the author’s conclusion.
Answer choice (E): This answer choice actually strengthens the author’s argument
by showing that a previously infected lobster is more resistant to re-infection by the
same parasite. Thus it would be even more difficult for An. haemophila to infect the
same lobster a second time.
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The gill lining of lobsters in which the disease-causing parasite   [#permalink] 01 Apr 2019, 04:43
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