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'''Eukaryotes '''are are eukaryotes  organisms whose cells are organized into complex structures by internal [[membrane|membranes]] and a [[cytoskeleton]]. [[animal|animals]], [[plant|plants]] and [[fungus|fungi]] are all eukaryotes, but [[bacteria]] are not.  

'''Eukaryotes ''' are organisms whose cells are organized into complex structures by internal [[membrane|membranes]] and a [[cytoskeleton]]. [[animal|animals]], [[plant|plants]] and [[fungus|fungi]] are all eukaryotes, but [[bacteria]] are not.  

The most characteristic feature of a eukaryotic cell, the nucleus, consists of a nucleoplasm surrounded by a double nuclear membrane pierced by nuclear pores. <ref>http://biotech.icmb.utexas.edu/search/dict-search.html</ref><ref>http://www.iscid.org/encyclopedia/Eukaryote</ref> The nucleoplasm contains the (linear) chromosomes of the cell, which are organised into heterochromatin, which stains only a little, and euchromatin, which stains more densely. The most important euchromatic area is the nucleolus, in which ribosomes are formed.

The most characteristic feature of a eukaryotic cell, the nucleus, consists of a nucleoplasm surrounded by a double nuclear membrane pierced by nuclear pores. <ref>http://biotech.icmb.utexas.edu/search/dict-search.html</ref><ref>http://www.iscid.org/encyclopedia/Eukaryote</ref> The nucleoplasm contains the (linear) chromosomes of the cell, which are organised into heterochromatin, which stains only a little, and euchromatin, which stains more densely. The most important euchromatic area is the nucleolus, in which ribosomes are formed.