1. Revenue bonds issued pursuant to the provisions of sections 205.161 to 205.169 shall be such denomination, shall bear such rate or rates of interest not to exceed the highest rate permitted by law, and shall mature at such time or times, not exceeding thirty-five years from their date of issue, as determined by the county commission in its order or resolution directing the issuance of such bonds. Such bonds may be either serial bonds or term bonds and may be issued with or without reservation of the right to call them for payment or redemption in advance of their maturity, upon the giving of notice, and with or without a covenant requiring the payment of a premium in the event of a call for redemption prior to maturity.

2. The bonds when issued and sold shall be negotiable instruments within the meaning of chapter 400, and the interest thereon shall be exempt from any state or local income taxes under the laws of the state of Missouri.