Breadcrumb Home Biology BIOL 320 BIOL 320: Principles of Microbiology Download as PDF Class Program Biology Credits 4 Fees $70 lab fee. Biology of microorganisms; the handling, culture and identification of bacteria. Three lectures, two laboratories per week. Prerequisites BI 104. BI 250 and CH 111 are recommended, but not required. BIOL 104: Principles of Biology Semester Offered Fall