Some embodiments include transistor-containing constructions having gate material within an opening in a semiconductor material and spaced from the semiconductor material by gate dielectric material. The opening has a wide lower region beneath a narrow upper region. A saddle region of the gate dielectric material extends outwardly from a bottom of the opening and is along the semiconductor material beneath the opening. A saddle region of the gate material extends outwardly from the bottom of the opening and is along the gate dielectric material beneath the opening. Source/drain regions are within the semiconductor material along sides of the gate material. Some embodiments include memory arrays.