1. The problem statement, all variables and given/known data A molecule of DNA is 2.17 micrometers long. The ends of the molecule becom singly ionized: negative on one end, positive on the other. The helical molecule acts like a spring and compresses 1.00% upon becoming charged. Determine the effective spring constant of the molecule. 2. Relevant equations I need a spring constant equation... Is this what I use? F=kx 3. The attempt at a solution The distance is going to be .01(2.17), but I'm not sure where to go from there. Could you please point me in the right direction? Thanks!