Cell theory is a foundational principle in biology that describes the properties of cells and explains their role in living organisms. The theory consists of three main principles:
All living organisms are composed of one or more cells.
This principle emphasizes that cells are the fundamental building blocks of life. Unicellular organisms, like bacteria or yeast, are composed of just one cell, whereas multicellular organisms, such as plants and animals, are made up of multiple cells working together.The cell is the basic unit of life, structure, and function in living things. It is the smallest unit capable of performing all essential life functions.
This principle highlights the importance of cells in providing structure and organization within living organisms. Different types of cells perform specific functions and work together to enable the organism's overall function and survival.Cells arise from pre-existing cells through the process of cellular division.
This principle states that new cells are created by existing cells undergoing a process called cell division. Cells replicate their genetic material (DNA) and physically divide into two daughter cells, allowing for growth, repair, and reproduction.
