1. Exams are given throughout the block. For instance, we are in Molecular Basis of Medicine (MBM) currently which runs 9 weeks. We have an exam every 3 weeks or so. It was in similar fashion for Human Structure. Throughout the two blocks we have clinical medicine (ICM) once a week and patient, physician, and society (PP&S) once a week during MBM. These classes have one or two exams throughout the block as well but aren't nearly as difficult or dense as the science courses.
2. I have yet to have had a pop quiz or heard of one administered here. There are sometimes a few clicker questions asked before a class but they would most likely don't count for points and they are announced regardless. I would say that the course directors are in theory probably allowed to give them out but again I've never heard of it happening.
3. Depending on the class, exams can be cumulative. Our MBM exams are cumulative and from my understanding they try to use the more high-yield board material for cumulative questions. I remember our human structure exams and practicals were cumulative as well.
4. At this point off the top of my head we have had one guest lecture during MBM where a genetics counselor came in during our genetics portion to talk about genetic testing. During Patient, physician, and society we have had a few lecturers that aren't really "guest" lecturers they are just professors in other departments on campus. For instance we had a few lectures from psychology from a professor in the psychology department. Really depends on the course.
5. To piggyback on question 4, it again depends on the class. Human Structure is taught by two professors that are PhD's however they really only run the anatomy courses for the medical school and for the anatomy graduate students. For MBM, the biochemistry portions are taught by PhDs except the genetics portion which is taught by Dr. Miller (an MD) who is a very renown geneticist from Dayton Children's hospital. The TBL portion of MBM is taught by two physicians, one being an MD/PhD. Clinical medicine is taught by an MD/PhD and all the small group preceptors are physicians. PP&S is ran by a physician and a PhD however some of the lecturers are PhD and some are physician. So it really depends on the class. Most of the sciences are going to be PhD however they usually do most of their teaching work with the medical school.