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As it receives nutrients from and expels wastes into its surroundings, it adheres to and cooperates with other cells.
Cooperative assemblies of similar cells form tissues, and a cooperation between tissues in turn forms organs, which carry out the functions necessary to sustain the life of an organism.
This article discusses the cell both as an individual unit and as a contributing part of a larger organism.
As an individual unit, the cell is capable of metabolizing its own nutrients, synthesizing many types of molecules, providing its own energy, and replicating itself in order to produce succeeding generations.
In addition, plant cells contain chloroplasts, which are responsible for photosynthesis, whereby the energy of sunlight is used to convert molecules of carbon dioxide (COcytosol.
Through many such cycles of cell growth and division, each parent cell can give rise to millions of daughter cells, in the process converting large amounts of inanimate matter into biologically active molecules.
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The overall process of cellular reproduction occurs in two steps: cell growth and cell division.
During cell growth, the cell ingests certain molecules from its surroundings by selectively carrying them through its cell membrane.