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Apr 2808:00 AM PDT
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Whether you are just beginning your MBA journey or fine-tuning your path to a 700+ score, GMAT Day is designed to give you a competitive edge.
22 Jan 2025, 23:37
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
75% (02:05) correct
25%
(02:09)
wrong
based on 251
sessions
History
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Not Attempted Yet
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.
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.
19 Feb 2025, 07:31
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@gmatninja could you please provide an explanation for this
21 Feb 2025, 10:56
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Conclusion: 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.
Pre-thinking: Show that An. haemophila. can still infect after 30days
(A) Other parasites are found more frequently in lobsters than An. haemophila.
We don't care about other parasites
(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.
We are not concerned about "parasite-rich" water. We are taking about lobsters in parasite-free water
(C) An. haemophila can also cause digestive and respiratory distress in infected lobsters.
We are not concerned about about affects caused by An. haemophila. We just want to know if An. haemophila. can be the cause of gill discoloration after lobster's transfer to parasite-free water
(D) In some cases An. haemophila migrates from the gill lining to the stomach, where it can then re-infect its original host.
This makes sense, this gives a way for An. haemophila. to reinfect even after 30days of transfer to parasite-free water (because it is already inside the lobster and not in the gill lining
(E) Once infected by a particular parasite, lobsters frequently develop a strong immunity to that parasite allowing them to better resist re-infection.
Goes in the opposite direction
Pre-thinking: Show that An. haemophila. can still infect after 30days
(A) Other parasites are found more frequently in lobsters than An. haemophila.
We don't care about other parasites
(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.
We are not concerned about "parasite-rich" water. We are taking about lobsters in parasite-free water
(C) An. haemophila can also cause digestive and respiratory distress in infected lobsters.
We are not concerned about about affects caused by An. haemophila. We just want to know if An. haemophila. can be the cause of gill discoloration after lobster's transfer to parasite-free water
(D) In some cases An. haemophila migrates from the gill lining to the stomach, where it can then re-infect its original host.
This makes sense, this gives a way for An. haemophila. to reinfect even after 30days of transfer to parasite-free water (because it is already inside the lobster and not in the gill lining
(E) Once infected by a particular parasite, lobsters frequently develop a strong immunity to that parasite allowing them to better resist re-infection.
Goes in the opposite direction
wasario
