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In response to viral infection, the immune systems of mice

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Re: In response to viral infection, the immune systems of mice [#permalink]

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New post 01 Jul 2016, 10:25
So, D essentially says that when the cause is absent, the effect is absent. Its a clear strengthener.
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Re: In response to viral infection, the immune systems of mice [#permalink]

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New post 01 Jul 2016, 23:27
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Re: In response to viral infection, the immune systems of mice [#permalink]

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New post 16 Dec 2016, 17:09
Dear all,

I have a different angle of view about this argument. I think the ones who select E may have the same thought as me. Could anyone give me a detailed explanation for my reasons below if you see it is flawed?

Based on the last sentence, the hypothesis of the scientists should be: (1) As the some eyes' cells are resemble to that of herpes, keratitis are mistakenly generated on those eyes' cell as a response of antibodies to herpes.
The hypothesis cannot be: (2) Keratitis are generated by antibodies to herpes.

If so, answer E strengthens (1) the best. It demonstrates keratitis can appear without herpes. It provides a signal for further studies that the antibodies mis-recognize eyes' cells as herpes in those cases.
Meanwhile answer D just strengthens (2). But I don't think (2) is a good interpretation of the scientists' hypothesis.
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Re: In response to viral infection, the immune systems of mice [#permalink]

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New post 17 Dec 2016, 09:59
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nathalie1107 wrote:
Dear all,

I have a different angle of view about this argument. I think the ones who select E may have the same thought as me. Could anyone give me a detailed explanation for my reasons below if you see it is flawed?

Based on the last sentence, the hypothesis of the scientists should be: (1) As the some eyes' cells are resemble to that of herpes, keratitis are mistakenly generated on those eyes' cell as a response of antibodies to herpes.
The hypothesis cannot be: (2) Keratitis are generated by antibodies to herpes.

If so, answer E strengthens (1) the best. It demonstrates keratitis can appear without herpes. It provides a signal for further studies that the antibodies mis-recognize eyes' cells as herpes in those cases.
Meanwhile answer D just strengthens (2). But I don't think (2) is a good interpretation of the scientists' hypothesis.


Choice E doesn't strengthen the argument.

E. Mice that have never been infected with a herpesvirus can sometimes develop keratitis.

If choice E is true, then the argument may be wrong. If mice that have never been infected with a herpesvirus can sometimes develop keratitis, keratitis could be caused by other reasons rather than antibodies to herpesvirus. How could we know that keratitis is caused by those antibodies in case that the mice aren't even infected with herpesvirus?
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In response to viral infection, the immune systems of mice [#permalink]

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New post 19 Dec 2016, 21:54
In response to viral infection, the immune systems of mice typically produce antibodies that destroy the virus by binding to proteins on its surface. Mice infected with a herpesvirus generally develop keratitis, a degenerative disease affecting part of the eye. Since proteins on the surface of cells in this part of the eye closely resemble those on the herpesvirus surface, scientists hypothesize that these cases of keratitis are caused by antibodies to herpesvirus.

Boil it down - Mice's immune systems produce antibodies. Scientists hypothesize that these cases of keratitis are caused by antibodies to herpesvirus.
Antibodies (X) cause keratities (Y)
Support - consider a case if x(cause ) is absent then y - the effect is also absent


D. There are mice that are unable to form antibodies in response to herpes infections, and these mice survive these infections without ever developing keratitis.


Answer D
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Re: In response to viral infection, the immune systems of mice [#permalink]

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New post 02 Jun 2017, 00:59
A) OFS. - Eliminate
B) OFS. - Eliminate
C) OFS. - Eliminate
D) no cause - no effect, hence strengthen and correct one
E) no cause but effect, hence weaken. - Eliminate
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Re: In response to viral infection, the immune systems of mice [#permalink]

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New post 13 Nov 2017, 09:25
this is really one hell of a tough question
damn had a hard time understanding this
Re: In response to viral infection, the immune systems of mice   [#permalink] 13 Nov 2017, 09:25

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