Section 35. The trustees shall elect the dean and such other officers and members of the professional staff of the medical school as they deem necessary and shall fix their classification, title and salary within the general salary schedule, except that any such salary shall be fixed at any amount not less than the minimum salary nor more than the maximum salary shown in the said schedule; provided, however, that the trustees may establish the salary for the dean and for the heads of department without reference to the general salary schedule and salary range. The trustees shall define the duties and tenure of office of all officers and members of the professional staff. The dean, under the president of the university, shall have the administrative responsibility of carrying out the policies established by the trustees for the conduct of said school and shall administer and coordinate its affairs.