The nucleus of eukaryotic cells control the behavior of the cells. For example, if amoeba is cut into 2, one half having nucleus and the other having no nucleus; the half without nucleus will lose its ability to digest food particles or to respond to stimuli. 

The internal organization of the nucleus shows a nucleolus and chromatin suspended in a proteinaceous continuum. The nucleus contains chemical substances and nucleic acid (RNA and DNA) histone, non-histone proteins, lipids, organic phosphorus compounds, deoxyribonucleoproteins and oxyribonucleoproteins. It carries the chromosomes which tend to crystallizes out during cell division.

The nucleus is surrounded by a double unit nuclear membrane which is provided with pores that punctuate it. It is absent in matured red blood cells.


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