There is no need to go thru any sort of interviews or medical entrance exams for any of the MRS streams. It is based on UAI cut-off. The 07 cut-off was 89.00, and has since then risen to 98.10 if i remember correctly.
I have no idea what you mean by the application form for undergrads...But for transferring I would imagine you would need at least need to have done some sort of science subjects (best to have anatomy and physiology, or radiation physics) if you want to transfer into MRS. For a more definitive answer you'd have to ask the MRS staff for more details.