DNA160-page7 - of DNA DNA of different species and of...

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DNA: Structure and Replication - 7 Two strands of nucleotides, with their bases hydrogen-bonded to each other would form a ladder if, and only if, the sugar phosphate backbones ran in opposite directions to each other, or anti-parallel to each other, and twisted to form a double helix. The end of a DNA molecule will have a free sugar (3' end) on one side of the "ladder" and a free phosphate (5' end) on the other side. (Note the importance of the 3' and 5') The constancy of the complementary base pairing is critical to the structure
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Unformatted text preview: of DNA. DNA of different species and of different genes shows variation in the sequence of base pairs in the DNA chain (which base pair follows the next). Once the structure of DNA was determined, active research could take place in how DNA can duplicate (or replicate) prior to cell division, based on the complementary base pairs, and in how DNA stores genetic information, which as we will learn, is in the sequence of nucleotides on the DNA strand....
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