A combined major in chemistry requires seven upper-division courses, in addition to senior thesis. This reduces the load of a regular chemistry major by two courses. The seven courses must include: CHEM 116L KS -Organic Chemistry and CHEM 117L KS -Organic Chemistry , CHEM 121 KS -Principles of Physical Chemistry and CHEM 122 KS -Principles of Physical Chemistry , at least one semester of Advanced Laboratory (either CHEM 126L KS or CHEM 127L KS ) and either CHEM 128 KS -Inorganic Chemistry or CHEM 177 KS -Biochemistry . The remaining elective can consist of either a single upper-division course or two halves. All lower-division courses and prerequisites in other disciplines (math, physics) must still be met.