You will have the opportunity to pursue an area of biology in much more substantial depth than is possible in classes. You will work closely with a faculty member, gaining a resource for career advice and letters of recommendation. The experience will help you to decide whether a research career is right for you.
Research is a challenging enterprise.
It involves focusing on an interesting question, choosing an appropriate approach, working through the inevitable problems that occur, interpreting your results critically, and communicating your conclusions effectively. These skills you will develop doing research are applicable to a broad range of future endeavors. Research skills are sought after by employers, graduate schools, and medical schools. It is fun. OK, it is also frustrating sometimes, but that makes the fun times all the more satisfying.