The register of deeds has the power to take acknowledgments, administer oaths, and certify the same by his or her signature. The register must keep a book in which every instrument filed for record in his or her office is entered and an official seal. The register of deeds may appoint one or more deputies for whose acts the register will be responsible. The deputy may not be the county treasurer, sheriff, clerk, or surveyor. If a register of deeds is not elected pursuant to section 32-518, the county clerk shall act as ex officio register of deeds.