Description: Biometric data linked to cell numbers, To Protect Yourself, Never Give Your DNA Or Biometric Data, Biometric Interview Process for FingerPrinting and Photograph at Visa Application Center, Biometric Registration
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The cell (from Latin cella , meaning "small room") is the basic structural, functional, and biological unit of all known living organisms . A cell is the smallest unit of life that can replicate independently, and cells are often called the "building blocks of life". The study of cells is called cell biology .
Cells consist of cytoplasm enclosed within a membrane , which contains many biomolecules such as proteins and nucleic acids . Organisms can be classified as unicellular (consisting of a single cell; including bacteria ) or multicellular (including plants and animals ). While the number of cells in plants and animals varies from species to species, humans contain more than 10 trillion (10 13 ) cells. Most plant and animal cells are visible only under the microscope, with dimensions between 1 and 100 microm
The cell was discovered by Robert Hooke in 1665, who named the biological unit for its resemblance to cells inhabited by Christian monks in a monastery. Cell theory , first developed in 1839 by Matthias Jakob Schleiden and Theodor Schwann , states that all organisms are composed of one or more cells, that cells are the fundamental unit of structure and function in all living organisms, that all cells come from preexisting cells, and that all cells contain the hereditary information necessary for regulating