In
cell biology, an organelle is a specialized subunit within a
cell, having a specific function, and separately enclosed within its own
lipid membrane. The name organelle comes from the idea that these structures are to cells what an
organ is to the
body (hence the name organelle, the suffix -elle being a
diminutive). Organelles are identified through the use of
microscopy, and can also be identified by
cell fractionation.There are many types of organelles, particularly in the
eukaryotic cells of higher organisms.
Prokaryotes were once thought not to have organelles, but some examples have now been identified.
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