The two strands of the helix-shaped DNA molecule are held together by electrostatic

Chapter 16, Problem 16.37

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The two strands of the helix-shaped DNA molecule are held together by electrostatic forces as shown in Fig. 1639. Assume that the net average charge (due to electron sharing) indicated on H and N atoms has magnitude 0.2e and on the indicated C and O atoms is 0.4e. Assume also that atoms on each molecule are separated by Estimate the net force between (a) a thymine and an adenine; and (b) a cytosine and a guanine. For each bond (red dots) consider only the three atoms in a line (two atoms on one molecule, one atom on the other). (c) Estimate the total force for a DNA molecule containing pairs of such molecules. Assume half are AT pairs and half are CG pairs

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