define cell define this cell
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biologyWRITTEN BYWilfred D. Stein See All ContributorsProfessor of Biophysics, Hebrew University of Jerusalem. Author of Transport and Diffusion Across Cell Membranes.See Article History
Alternative Title: cell system
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Consider how a single-celled organism contains the necessary structures to eat, grow, and reproduce
Consider how a single-celled organism contains the necessary structures to eat, grow, and reproduce
Cells are the basic units of life.
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Cell, in biology, the basic membrane-bound unit that contains the fundamental molecules of life and of which all living things are composed. A single cell is often a complete organism in itself, such as a bacterium or yeast. Other cells acquire specialized functions as they mature. These cells cooperate with other specialized cells and become the building blocks of large multicellular organisms, such as humans and other animals. Although cells are much larger than atoms, they are still very small. The smallest known cells are a group of tiny bacteria called mycoplasmas; some of these single-celled organisms are spheres as small as 0.2 μm in diameter (1μm = about 0.000039 inch), with a total mass of 10−14 gram—equal to that of 8,000,000,000 hydrogen atoms. Cells of humans typically have a mass 400,000 times larger than the mass of a single mycoplasma bacterium, but even human cells are only about 20 μm across. It would require a sheet of about 10,000 human cells to cover the head of a pin, and each human organism is composed of more than 30,000,000,000,000 cells.
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Cell is the stuctural and functional unit of all living object.
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