MCAT Question of the Day
    •

    Q:

    		 A piece of DNA is labeled so that all of the bases fluoresce red. A student adds a polymerase which uses only blue labeled bases, and allows the DNA to replicate twice. After the completion of both cycles, the student adds another polymerase which only uses green bases, and allows the DNA to replicate once more. What are the colors of the newly replicated DNA strands?
    		 

    A

    		 2 red/green, 2 all blue, 4 green/blue

    B

    		 2 red/green, 6 green/blue

    C

    		 2 red/blue, 2 all green, 2 all blue, 2 green/blue

    D

    		 2 red/blue, 4 all blue, 2 green/blue



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