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A [[cell]] with a clearly defined nucleus and other structured subcellular components such as [[organelles]]. <ref> http://biotech.icmb.utexas.edu/search/dict-search.html</ref>  All plants, animals, fungi, and single cell protists are composed of eukaryotic cells, and are collectively called [[eukaryotes]].<ref>http://www.iscid.org/encyclopedia/Eukaryote</ref> Compared to organisms lacking a nucleus ([[prokaryotes]]), eukaryotic genomes are far more complex structurally, contain multiple chromosomes, and are subject to a greater level of gene regulation. <ref> Berg, Jeremy M.; Tymoczko, John L.; and Stryer, Lubert."Biochemistry". W. H. Freeman and Co. ; c2002 </ref>

A [[cell]] with a clearly defined nucleus and other structured subcellular components such as [[organelles]]. <ref> http://biotech.icmb.utexas.edu/search/dict-search.html</ref>  All plants, animals, fungi, and single cell protists are composed of eukaryotic cells, and are collectively called [[eukaryotes]].<ref>http://www.iscid.org/encyclopedia/Eukaryote</ref> Compared to organisms lacking a nucleus ([[prokaryotes]]), eukaryotic genomes are far more complex structurally, contain multiple chromosomes, and are subject to a greater level of gene regulation. <ref> Berg, Jeremy M.; Tymoczko, John L.; and Stryer, Lubert."Biochemistry". W. H. Freeman and Co. ; c2002 </ref>