About Lesson
Introduction
- The cell is the basic structural and functional unit of all known living organisms. It is the
- smallest unit of life that is classified as a living thing, and is often called the building block of
- The cell was discovered by Robert Hooke in 1665.
- The cell theory, first developed in 1839 by Matthias Jakob Schleiden and Theodor Schwann, states that all organisms are composed of one or more cells, that all cells come from preexisting cells, that vital functions of an organism occur within cells, and that all cells contain the hereditary information necessary for regulating cell functions and for transmitting information to the next generation of cells.
