I have decent stats -- MCAT (34/0), GPA (3.7, chem major) -- lots of relevant volunteer hours, clinical work experience, community service, etc. -- but no research. I just didn't have the time or inclination, although I could possibly do some my senior year. Is this going to be a big negative in the application process? List includes schools across the spectrum of selectivity. What do I say if asked about lack of research?