MCAT Question of the Day
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    Q:

    		 DEET is an organic compound that has been shown to be effective at repelling mosquitoes. Despite being in use for decades, mosquitoes have not developed notable resistance to the compound and it remains an effective repellent. In contrast, bed bugs, which feed primarily on human blood, have largely grown resistant to most pesticides used to exterminate them. Which of the following best explains why mosquitoes have not developed resistance to DEET?
    		 

    A

    		 The evolutionary timescale for mosquitoes is too long to develop resistance in a few decades.

    B

    		 Humans are only incidental prey for mosquitoes, which consume most of their blood from birds and other mammals.

    C

    		 DEET is not toxic to mosquitoes.

    D

    		 DEET use is relatively widespread and used frequently in the presence of most mosquito populations.



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