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NBME 21 Answers

nbme21/Block 2/Question#36 (15.7 difficulty score)
An investigator is conducting a study of ...

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submitted by hungrybox(791),
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teinFdUreivi gt-;& dues fro sonfui fo HVI ursiv dan arttge lcel

aishu007  we can also say it enfuviritide blocks entry +  
aishu007  of virus into cell +  

Didanosine, Lamivudine, and Tenofovir are NRTIs that inhibit nucleotide biding to reverse transcriptase and terminate the DNA chain so those don't affect viral entry. Nevirapine is an NNRTIs that binds to reverse transcriptase and thus also doesn't affect viral entry. Enfuvirtide binds gp41 to inhibit the fusion of HIV and the target cell, thus inhibiting viral entry.