You will need a graduate degree for research.
At http://bmcdb.ucdavis.edu/admissions/index.html is an example of how a chemistry degree qualifies you to apply to a molecular biology graduate program. “Prerequisites include calculus; statistics; physics; general chemistry; organic chemistry; biology; biochemistry; genetics,” says the site. Obviously, if you can, take your intended graduate program’s prerequisite courses as an undergraduate. In some graduate programs you can take the program’s prerequisite courses after being admitted to the program, although that doesn’t seem the case with the one I have cited.