MCAT Question of the Day
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    Q:

    		 Zoonotic viruses are able to infect multiple different species. Viral entry points are often highly specific; if a cell lacks the specific protein or marker that a virus uses to enter, the cell will not be infected. Which of the following can be expected from the entry proteins on cells that can be infected by a zoonotic virus?
    		 

    A

    		 Homology and degree of amino acid sequence identity for the protein have little impact on whether other species are susceptible to the virus.

    B

    		 Members of a class of species are more likely to be infected by the zoonotic virus than members of a family of species

    C

    		 Other species have a homologous protein with a high degree of identity with the cells in question.

    D

    		 No other species share a similar protein in terms of amino acid sequence.



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