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05 May 2020, 01:52
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D
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Difficulty:
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Question Stats:
83% (01:36) correct
17%
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wrong
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A recent study suggests that Alzheimer’s disease, which attacks the human brain, may be caused by a virus. In the study, blood from 11 volunteers, each of whom had the disease, was injected into rats. The rats eventually exhibited symptoms of another degenerative neurological disorder, Creutzfeldt-Jakob disease, which is caused by a virus. This led the scientist who conducted the study to conclude that Alzheimer’s disease might be caused by a virus.
Which one of the following statements, if true, would most strengthen the scientist’s hypothesis that Alzheimer’s disease is caused by a virus?
(A) Alzheimer’s disease in rats is not caused by a virus.
(B) Creutzfeldt-Jakob disease affects only motor nerves in rats’ limbs, not their brains.
(C) The virus that causes Creutzfeldt-Jakob disease in rats has no effect on humans.
(D) The symptoms known, respectively, as Creutzfeldt-Jakob disease and Alzheimer’s disease are different manifestations of the same disease.
(E) Blood from rats without Creutzfeldt-Jakob disease produced no symptoms of the disease when injected into other experimental rats.
05 May 2020, 02:22
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D is the answer.
"This led the scientist who conducted the study to conclude that Alzheimer’s disease might be caused by a virus." this is the conclusion. To strengthen the conclusion and the premise that support it, we can show some connection between the build up to the diseases or the two diseases.
D offer such explanation. It says that the two diseases are same in nature.
A weakens the conclusion.
B and C offer unnecessary explanations.
"This led the scientist who conducted the study to conclude that Alzheimer’s disease might be caused by a virus." this is the conclusion. To strengthen the conclusion and the premise that support it, we can show some connection between the build up to the diseases or the two diseases.
D offer such explanation. It says that the two diseases are same in nature.
A weakens the conclusion.
B and C offer unnecessary explanations.
05 May 2020, 12:13
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So we have that D is the statement that most strengthens the assumption:
(A) Alzheimer’s disease in rats is not caused by a virus.
If the disease is not caused by a virus, it contradicts so weakens the assumption.
(B) Creutzfeldt-Jakob disease affects only motor nerves in rats’ limbs, not their brains.
This does not impact the assumption, is indifferent to us.
(C) The virus that causes Creutzfeldt-Jakob disease in rats has no effect on humans.
If the virus does not affect humans, then, there is no relation between the virus and humans, it weakens our argument. Wrong.
(D) The symptoms known, respectively, like Creutzfeldt-Jakob disease and Alzheimer’s disease are different manifestations of the same disease.
If both diseases' symptoms are different manifestations of the same disease and one of them is caused by a virus, the other should be too. Right.
(E) Blood from rats without Creutzfeldt-Jakob disease produced no symptoms of the disease when injected into other experimental rats.
If the disease is caused by a virus, it should be transmitted to other rats, this weakens our argument. Wrong.
Regards,
Pablo
(A) Alzheimer’s disease in rats is not caused by a virus.
If the disease is not caused by a virus, it contradicts so weakens the assumption.
(B) Creutzfeldt-Jakob disease affects only motor nerves in rats’ limbs, not their brains.
This does not impact the assumption, is indifferent to us.
(C) The virus that causes Creutzfeldt-Jakob disease in rats has no effect on humans.
If the virus does not affect humans, then, there is no relation between the virus and humans, it weakens our argument. Wrong.
(D) The symptoms known, respectively, like Creutzfeldt-Jakob disease and Alzheimer’s disease are different manifestations of the same disease.
If both diseases' symptoms are different manifestations of the same disease and one of them is caused by a virus, the other should be too. Right.
(E) Blood from rats without Creutzfeldt-Jakob disease produced no symptoms of the disease when injected into other experimental rats.
If the disease is caused by a virus, it should be transmitted to other rats, this weakens our argument. Wrong.
Regards,
Pablo
