(1) An atom's central core, containing protons and neutrons. (2) The chromosome-containing organell of a eukaryotic cell. (3) A cluster of neurons.
One of several formed bodies with specialized functions, suspended in the cytoplasm of eukaryotic cells.
A type of cell lacking a membrane-enclosed nucleus and membrane-enclosed organelles. Organisms with prokaryotic cells (bacteria and archaea) are called prokaryotes.
A type of cell with a membrane-enclosed nucleus and membrane-enclosed organelles. Examples of organisms with these cells are protists, plants, fungi, and animals.