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.
After you submit you enter a waiting period for verification. During the verification process AMCAS compares your official transcripts to what you have entered on your AMCAS application. AMCAS will also convert your grades to AMCAS grades and an AMCAS GPA to provide a standardized GPA to medical schools.