生物学中的微生物学选项提供了分子生物学，遗传学，细胞生物学，微生物分类，功能和生态学方面的广泛知识和经验背景。在真菌学（真菌研究），植物学（藻类研究），细菌学（细菌研究），古细菌生物学（极端环境微生物），病毒学（病毒研究），免疫学，寄生虫学，致病菌和微生物发酵。
Biology is one of the most basic fields of science with direct application to humans. Our continued existence on planet Earth depends in large part on how we resolve problems of a biological nature. Biology is a broadly based discipline encompassing a variety of subjects ranging from medicine to ecology. The Biology program at WIU is designed to provide students with a broad exposure to the various areas of Biology.<br><br>Majors are offered in Biology (with options in Botany, Environmental Biology, Microbiology, Zoology, Medical Sciences, and ScienceBiology Teacher Education) and Clinical Laboratory Science leading to a Bachelor of Science degree. Minors are offered in Botany, Horticulture, Microbiology, Middle Level Science Teaching, and Zoology.