Medical scientists usually need a doctorate degree in biological science. Some medical scientists have medical degrees. Medical scientists typically complete courses in biology, chemistry, physics, engineering, mathematics, and computer science.
Status: Medical Student (Accepted) AMCAS states that it usually takes ~4-6 weeks for verification to go through, but looking at the verification trend right now here: http://forums.studentdoctor.net/threads/2014-2015-verification-thread.1076112/ I would say you're looking at 3-4 weeks from the time of submission.
The application deadline is the date by which your application must be submitted to AMCAS. You must submit your application, agree to the certification statement, and pay the appropriate application fees by 11:59 p.m. ET of the deadline date. Your application does not need to be processed/verified by the deadline date.