Anonymous
Anonymous asked in Science & MathematicsBiology · 1 month ago

Watson and Crick identified the structure of DNA and proposed a mechanism by which the genetic information could be copied ?

(complementary base pairing and nucleic acid strands). One of the key elements of their model was that the two strands of the double helix were antiparallel because that arrangement created the strongest/most hydrogen bonds between complementary bases. What does it mean that the complementary strands in the double helix are antiparallel?

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  • 1 month ago

    > and proposed a mechanism

    Actually, they didn't.  They implied it.  They didn't come right out and propose it.  Check the wording of their paper.

    > What does it mean that the complementary strands in the double helix are antiparallel?

    If you held a DNA strand vertically and called one strand "right side up" then the complementary strand would be "upside down."

    Or if you wrote down the paired sequence with one strand on one line and the complement below it on another line, one strand would have the 5' end on the left with the 3' end on the right, while the complementary strand would have the 3' end on the left and the 5' end on the right.

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