Cells160-page1 - Cell 1 Just as the atom is the fundamental...

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Cell - 1 Just as the atom is the fundamental unit of matter, the cell is the fundamental unit of living organisms. Each cell is unique, composed of carbohydrates, proteins, lipids, and other substances, organized into an orderly structural and functional unit. We shall, in this chapter, see how the structure of cells and, in particular, the structure of cell components, facilitates the functioning of cells. History of the cell The study of cells dates back more than three hundred years, coinciding with the development of microscopes. As scientists over the years learned more about cells, a group of common characteristics was developed which we call the Cell Theory. Our use today of more sophisticated microscopes and research on biochemical cell activities reinforces these premises. The Cell Theory 1. Every living organism is made up of one or more cells. 2. Cells are the structural and functional unit of living organisms. The smallest
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