There is a straight science pre-professional tract with the college of science...and here's some info about the program like you requested:
Here is the link to the staight breakdown of credit hours per subject:
http://www.science.nd.edu/science_un...jor_SUM_02.htm
And here is the link for the "suggested four year plan" (note this is for the average student and it is always possible to modify this...)
http://www.science.nd.edu/science_un..._major_SUG.htm
Now then to address your question, why should you have to take more than the minimum number of required classes. Simple, it makes you look a little more competitive. Most, but not all, end up taking Molecular Cell Biology and vertebrate physiology. 1) because it makes their app a little more strong (or so they think) 2) it helps prepare them for taking these classes in first year med school. I also know people who take Human Anatomy here (note this is a class, there is not a lab associated with it that I know of)
Basically going beyond the minimum only serves to enhance your package. A lot of premed majors end up doing service up here at the St. Joseph Regional Medical Center or try to get involved with a variety of on-campus clubs.
I'll post some info on classics later. One of my roommates one year was a classics major. That and I used Latin as my language requirement up here so I have had some exposure to the dept. Hope this info helps you out.