(XXX) 7. The two strands of the helix-shaped DNA molecule are held together by electrostatic forces as shown in class. D

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Xxx 7 The Two Strands Of The Helix Shaped Dna Molecule Are Held Together By Electrostatic Forces As Shown In Class D 1 (533.82 KiB) Viewed 34 times

(XXX) 7. The two strands of the helix-shaped DNA molecule are held together by electrostatic forces as shown in class. Due to electron sharing, the magnitude of the net average charge on the H and N atoms, each, is 0.2e. The net average charge on the C and 0 atoms, each, is 0.4e. The distance between any two adjacent atoms on the same molecule is 0.1nm. a. Calculate the net force between the thymine and adenine pair of molecules. (Hint: Since electric fields decrease as an inverse square law, they die off quickly with distance. So, the only fields that really contribute to any given bond are due to the 3 atoms along the red dotted line in the class diagram, two atoms on one molecule and one atom on the other molecule. There are two bonds to consider, the OHN bond at the top and the NHN bond just below. 1. Calculate the net electric field at the oxygen atom of thymine in the OHN bond. 2. Calculate the net electric field at the nitrogen atom of adenine in the NHN bond. 3. Using the above results, calculate the net force between the thymine and adenine pair of molecules.)