HI! First of all, relax. The interview is really mellow and laid back. Cathy did most of the talking and Dr. Selcer is really quiet. The first question was about your background i.e, major, college, what have you been doing since then..etc. Then they asked about why medicine.. because I wasn't a bio major. They also want to know what you want out of the program, why Duq's program, and that's about it. They also went through whatever prereq's I completed and we made a list of what classes I still needed to complete.
I had prepared for it like it was going to be a med school interview... but it was really laid back. You can ask about where most students live, what the post bacc community is like, are professors accessible, ECs you can do while you're in the program.
PM me if you need more specifics. Good luck, I'm sure you'll do a terrific job!