In cell biology, an organelle is one of several structures with
specialized functions, suspended in the cytoplasm of a
eukaryotic cell. Eukaryotes are the most structurally complex
known cell type, and by definition are in part organized by
smaller interior compartments, that are themselves enclosed by
lipid membranes that resemble the outermost cell membrane. The
larger organelles, such as the nucleus and vacuoles, are easily
visible with moderate magnification (although sometimes a clear
view requires the application of chemicals that selectively
stain parts of the cells); they were among the first biological
discoveries made after the invention of the microscope. For more
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