Most schools will
not list the schools as "on line" or distance learning" on your transcript. You should give Berkeley a call but I did not see anyone having problems with this when I searched the topic last year. You may want to call a few DO schools and see what they say.
UNECOM offers a biochem class online to fulfill their biochem requirement, not sure on their policy.
Don't get burned taking an insanely hard online course:
http://www.ratemyprofessors.com/