Cell structure. Transmission electron micrograph (TEM) of a section through an undifferentiated cell from the intestinal tract, showing golgi bodies, ( pink and cyan membranes) and mitochondria (purple). Undifferentiated cells like this serve as replacements for cell types both in the glands and villi of the intestine.The Golgi apparatus is an organelle that functions as a central delivery system for the cell. Its primary function is to modify, store and transport proteins and lipids made elsewhere in the cell. The organelle's structure consists of a stack of flattened, membranous, disc-like structures called cisternae. Magnification: x4000 when printed 10 centimetres wide.