They do most of the work in cells and are required for the structure, function, and regulation of the body's tissues and organs. Proteins are made up of hundreds or thousands of smaller units called amino acids, which are attached to one another in long chains.
At the top of the epidermis of a plant you will find the cuticle, which is a waxy covering and the cuticle protects the plant. The endodermis is in the middle of the plant and is a layer of cells.
