NucleusA cellular
organelle of <!g>eukaryotes, enclosed in a definite membrane that is essential to
cell functions.  Its center is
called a nucleolus, which contains the <!g>DNA (<!g>chromosomes) along with proteins
that aid its replication and translation into <!g>RNA.  
  
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Images:
Sinauer Associates 
Contributed by: BU 
  
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