Cells are the basic units of life from "summary" of Making Sense of Life by Evelyn Fox KELLER,Evelyn Fox Keller
The idea that cells are the basic units of life is fundamental to our understanding of biology. It is a concept that has stood the test of time, dating back to the work of early biologists who first observed and described cells under the microscope. The cell theory, as it came to be known, states that all living organisms are composed of cells, that cells are the basic structural and functional units of life, and that all cells come from pre-existing cells. Cells are remarkable in their complexity and diversity. They come in different shapes and sizes, and can perform a wide variety of functions. Some cells, like nerve cells, are specialized for transmitting electrical signals, while others, like muscle cells, are specialized for contraction. Yet despite their diversity, all cells share certain characteristics in common. They are surrounded by a membrane that separates the interior of the cell from its external environment, they contain genetic material in the form of DNA, and they are capable of carrying out the processes necessary for life, ...
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