The bonds, notes, and other forms of indebtedness must be signed in the corporate name of the university by the manual or facsimile signature of the acting chairman of the board of the university, under the corporate seal of the university attested by the manual or facsimile signature of the acting secretary of the board. Interest coupons attached to the bonds, notes, and other forms of indebtedness must be signed by the facsimile signatures of these officers. The bonds, notes, and other forms of indebtedness may be issued notwithstanding that any of the officials signing them or whose facsimile signatures appear on the coupons have ceased to hold office at the time of the issue or at the time of the delivery of the bonds, notes, and other forms of indebtedness to the purchaser.