Mo. Rev. Stat. § 162.511

Except as provided in laws specifically applicable to urban districts the board in any urban district shall perform the same duties and be subject to the same restrictions and liabilities as the school boards of other school districts acting under the general school laws of the state. A majority of the board constitutes a quorum for the transaction of business. No contract shall be let, teacher employed, bill approved or warrant ordered unless a majority of the board shall vote therefor, but this provision does not apply to the reemployment of any teacher. It shall provide and keep a corporate seal.