The cell structure and function is usually described using the eukaryotic cell. While prokaryotic cells are usually single called organisms such as bacteria, eukaryotic cells are usually multicellular organisms.
Both cells however have a cell membrane which holds and separates the cell from its external environment, a cytoplasm which is all of the cell material enclosed by the membrane and a nucleiod containing genetic material which is the DNA. Including prokaryotic (simple structure with no membrane bound organelles) and eukaryotic (complex structure with membrane bound organelles) cells.
Usually cells are microscopic which means they can not be seen with the naked eye. Which means an organism can consist of a single cell or multiple cells. Cells are the smallest structural and functional units of an organism.
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