Cell Theory : The Basic Unit Of Life And Is The Smallest Structure That Can Live An Independent Life

1000 Words Nov 18th, 2015 null Page
The cell is the basic unit of life and is the smallest structure that can live an independent life. In 1665, Robert Hook was the first person to identify cells and name them. He also noticed that plants were made up of cells and this finding introduced the beginning of cell theory. Cell theory summaries Hook’s findings that cells make up all living organism, can only be produced from pre-existing cells and are the smallest living organism. The size of the cells is due a dependence on diffusion of different substances moving in and out of cell.

Fictional specialization allows for individual cells to coordinate tasks. “Structural variation in relation to function exists because each cell’s structure is exactly tailored to suit its function. Once a new cell has been formed by cell division it becomes specialized by undergoing physical and chemical changes until it’s sizes, shape and chemical ‘machinery’ are perfectly suited to its future role in a particular tissue.’’ (James Torrance, 2008, p.3) The advantage of cellular specialization is that a specialized tissue can perform its function more effectively and multi-cellular organisms can function at a more improved level compared to a unicellular organism.

All biological membranes have a similar structure. Cells are enclosed by the plasma membrane which forms a barrier between the cytoplasm and the surrounding environment. The plasma membrane is composed of phospholipids and protein molecules. The exact order of the…

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