Nevertheless, recall that there are no chemical bonds between the information-carrying bases along the axis of the DNA molecule where the genetic instructions are encoded. Consequently, forces of chemical attraction do not determine the arrangement of the bases any more than laws of physics determine the arrangement of letters in a line of Shakespearean verse.15 When I was a professor, I used to illustrate this fact with a simple analogy. I would place magnetic letters on a metallic surface and then show how the letters could be arranged and rearranged in many possible ways. I did this to show
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