This document discusses cell structure and function. It begins by defining prokaryotic and eukaryotic cells, then discusses the history of cell discovery. This led to the Cell Theory which states that all living things are made of cells, cells are the basic unit of life, and new cells are produced from existing cells. The document then describes the structures of prokaryotic and eukaryotic cells in detail, including their organelles and differences. It provides examples of cell types and concludes with self-test questions to check understanding.