The biology of microorganisms, with an emphasis on diversity, disease, and the environment. Includes 3 hours of lecture each week. Recommended: CHEM 3371, CHEM 3117. Prerequisites: BIOL 1301/BIOL 1101 (or BIOL 1401), BIOL 1302/BIOL 1102 (or BIOL 1402) and C- or better in BIOL 3304.