Taking Prereqs online! (Univ of Rochester) Anyone done this before?

Taking Microbiology and Anatomy & Physiology I&II (both together in one semester). Anyone done online courses before? If so, are these relatively easy courses for a non-science graduate? Both are fast track courses. I plan to take Microbio asap (I can choose to complete it before Dec 31 since it's a self paced course). Then I plan to take A&P I, II in January. There's no lab; it's all online. Here's one course description: http://www.edvantagehealth.com/detail.cgi?id=NSG_314

Anyone familiar with these courses?