A continuation of the material covered in CHEM 420 with an emphasis on metabolic processes. Lecture only. This course is cross-listed as BIOL 425. Students may receive credit for either course but not both. Prerequisite: CHEM 420 with a grade of C- or better. Formerly CHEM422/BIOL424. Not open to students who have received credit for CHEM422 or BIOL424. Students may receive credit for either course but not both.