Energy is also needed to actively transport molecules through cell walls to make sure that nutrients and other molecules get to where they are needed. Active transport takes place against a diffusion gradient and the use of energy allows organisms to control their internal environment more efficiently.
Living things also need energy to move - all organisms use movement even plants that don't appear to. Their chromosomes move during cell division and that, like all movement, requires energy.
Energy is also required for temperature control in warm blooded animals. Endotherms use large amounts of heat energy to keep their body temperature constant.
A few organisms use energy to produce light - like fireflies or to produce electricity - such as electric eels.