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December 10, 2016

Homework Help: Physics

Posted by Adam on Monday, February 4, 2013 at 3:59pm.

The two strands of the helix-shaped DNA molecule are held together by electrostatic forces as shown in the Figure 16-44 in the textbook. Assume that the net average charge (due to electron sharing) indicated on H and N atoms is 0.2e and on the indicated C and O atoms is 0.4e. Assume also that atoms on each molecule are separated by 1.0*10^ - 10m.

a)

Estimate the net force between a thymine and an adenine. For each bond (red dots) consider only the three atoms in a line (two atoms on one molecule, one atom on the other). I got 4.6*10-10 N

b)Estimate the net force between a cytosine and a guanine.

7.1*10^-10 N

c)Estimate the total force for a DNA molecule containing 10^5 pairs of such molecules.

I don't understand this part I added and subtracted a from b but both answers were wrong please help me out thank you

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