Individual membership in TriBeta is through a chapter on the campus of a four-year accredited college or university. There are now more than 380 chapters offering their members activities and experiences that enrich and extend but do not duplicate the primary requirements for the biology major. The national constitution provides a framework for chapter activities, but each chapter is free to function in accordance with its own needs and school philosophy. A national officer visits each prospective chapter as part of the application process. Chapter programs typically include guest speakers, reports of research by members and department faculty, field trips, maintenance of collections, community service, and social gatherings.
Most chapters have a lounge or office on campus.
A faculty advisor provides continuity and experience to the student members. National registration fees help support 15 district conventions every year and the national convention every other year. Just as the local chapter is the center of TriBeta programs, the district convention is the most important regional project. It offers members a chance to report their research and to hear from outstanding graduate investigators and teachers who give invited lectures and hold informal discussions. Field trips have become an important part of the national convention which is often centered around some biological feature unique to the convention locale.