1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Estimating entropy in DNA packing

  1. Dec 8, 2009 #1
    1. The problem statement, all variables and given/known data
    Estimate total work that motor [tex]\phi[/tex]29 needs to perform to overcome entropy loss of packing DNA

    2. Relevant equations

    This equation gives the end to end distribution or a 3D random walk with N segments length a.

    3. The attempt at a solution
    I'm not 100% sure where to start on this. I've been trying to figure it out all day, honestly. I know that DNA has a persistence length a[tex]\approx[/tex]100nm because it's fairly rigid over about 300 base pairs. It is therefore modeled as N=65 segments.
    I'm not sure where to go from here though. How do I come up with the entropy change by putting the DNA in the capsule?

    I planned to model the capsule as a sphere of radius 20nm. Any help on where to go from here?

  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted