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I’ve had some requests for some more molecular puzzles since the last one that I posted (see A DNA puzzle ). One person liked it so much he even blogged about it.

So, here’s one for you to chew on over the weekend.

This puzzle is a variation of an activity in Exploring DNA Structure, a CD/lab book that I made (with funding from the NSF) and used for some educational research.

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Any ideas?



  1. #1 Toaster Sunshine
    July 27, 2007

    I’m going to hazard a guess and posit that it is A-DNA. B-DNA has a central axis of H-bonding and Z-DNA is left-handed, and has nucleotides spaced farther apart.
    I am not, however, going to posit that my hazarded guess completely correct.

  2. #2 Steve Loughran
    July 29, 2007

    Is that an oxygen I see attached to the 2′ carbons on the right hand strand?

    Kind of looks to me like RNA hybridized to DNA.

  3. #3 Sandra Porter
    July 30, 2007

    Interesting guesses.

    I’ll post the answer on Friday.

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