Cell Theory: Statement and Definition

Cell Theory: Statement and Definition

The cell theory was proposed by two scientists: Matthias Schleiden and Theodor Schwann. Matthias Schleiden, a German botanist, formulated the concept that plants are composed of cells in 1838. Theodor Schwann, a German physiologist, extended this idea to animal tissues and proposed that animals are also composed of cells in 1839. Together, their contributions formed the basis of the cell theory

Postulate of cell theory

The cell theory consists of three main principles:

1. All living organisms are composed of cells: According to the cell theory, all living things, from the simplest single-celled organisms to complex multicellular organisms, are made up of cells. Cells are the smallest structural units of life and are responsible for carrying out the essential functions necessary for an organism's survival and reproduction.

2. The cell is the basic unit of structure and organization: The cell is considered the fundamental building block of life. It is the smallest unit that retains all the characteristics and functions of a living organism. Cells vary in size, shape, and specialized functions, but they all share certain structural components, such as a cell membrane, genetic material (DNA or RNA), and cytoplasm.

3. Cells arise from pre-existing cells: The cell theory states that new cells are formed through the division of pre-existing cells. This principle, known as cell division, applies to all living organisms. When a cell divides, it gives rise to two or more daughter cells, each containing a complete set of genetic material inherited from the parent cell. This process allows for growth, repair, and reproduction in living organisms.

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