The basic generalizations accepted by modern science about cells are called cell theory. These foundational principles describe the nature and role of cells in all living organisms. The core tenets of modern cell theory are:
- All living things are composed of one or more cells
- The cell is the fundamental unit of structure and function in all living organisms
- All cells arise from pre-existing cells through cell division (the principle of biogenesis)
Modern cell theory also incorporates additional concepts, including:
- Energy flow (metabolism and biochemistry) occurs within cells
- Cells contain genetic material (DNA) that is passed to daughter cells during cell division
- All cells of similar species have a similar chemical composition
These generalizations form the foundation of modern biology and are essential for understanding the structure, function, and continuity of life
