Cells are the basic unit of all living organisms. Cell can be defined as the basic structural and functional unit of life. It is typically microscopic and consists of a membrane bound cytoplasm and nuclear content which could either be membrane bound (Eukaryotes) or not membrane bound (Prokaryotes)
(https://justbiology94.blogspot.com/2025/03/cell-biology-unraveling-mysteries-of.html)
The discovery of cell is largely attributed to Robert Hooke in 1665, when he made the light microscope and viewed the cut section of the cork. This began the scientific study of cells, also known as Cytology/Cell Biology. In 1676, however, Anton Van Leeuwenhoek discovered that the cell contained organells, which proved that the cell was alive. For a very long time, many debates about cells began amongst scientists. Most of these debates involved the nature of cellular regeneration, and the idea of cells as a fundamental unit of life.
Cell theory was eventually formulated in 1839. This is usually credited to Matthias Schleiden and Theodor Schwann However, many other scientists like Rudolf Virchow contributed to the theory. This was an important step away from sponteanous regeneration of life.
(https://justbiology94.blogspot.com/2025/03/cell-biology.html)
All living organisms are composed of one or more cells.
The cell is the basic unit of structure and organization in organisms.
Cells arise from pre-existing cells.
The generally accepted parts of modern cell theory include:
All known living things are made up of one or more cells
All living cells arise from pre-existing cells by division.
The cell is the fundamental unit of structure and function in all living organisms.
The activity of an organism depends on the total activity of independent cells.
Energy flow (metabolism and biochemistry) occurs within cells.
Cells contain DNA which is found specifically in the chromosome and RNA found in the cell nucleus and cytoplasm.
All cells are basically the same in chemical composition in organisms of similar species.
The modern version of the cell theory includes the ideas that:
Energy flow occurs within cells.
Heredity information (DNA) is passed on from cell to cell.
All cells have the same basic chemical composition.
An example of a single free living cell
An example of a filamentous cell
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