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li5504552
Joined: 20 Jun 2007
Posts: 64
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 Posted: Sun Jul 22, 2007 8:41 pm Post subject: Question 8 |
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| - I am confused why answer is A and not B? thanks |
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admin
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Joined: 08 Dec 2003
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| Posted: Wed Jul 25, 2007 11:44 pm Post subject: |
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The answer cannot be B because (a) the passage said that HBsAg is a protein thus it cannot be a "nucleic acid"; (b) to have immunity against a pathogen (virus, bacteria), it must attack the surface (plasma membrane, cell wall, viral capsid) but antibodies can't cross the surface of pathogens to get inside.
Lastly, something you definitely don't need to have known, but normally Ag stands for antigen and from the passage HB is hepatitis B. The s is for surface. |
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admin
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| Posted: Thu Jul 30, 2009 3:08 pm Post subject: |
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