The nucleus is a membrane enclosed organelle in all eukaryotic cells. The nucleus of a cell contains the cell’s nuclear genome. The DNA in each cell provides that cell with that cell’s unique characteristics as well as the unique characteristics of the organism in which the cell belongs. The chromosomes in a nucleus are formed by a protein unique to DNA called histone. Nuclear transport is vital to cell function because movement through the cell’s pores influences gene expression and chromosomal up-keep. When the cell splits via mitosis, the nucleus duplicates the chromosomes within so the new cell has a complete set for its genetic make-up.
The nucleus has a very distinct physical make up. Around the nucleus is the nuclear envelope. This envelope contains nuclear pores to allow the movement of molecules. The pores of a nucleus are in the envelope and the nuclear membrane itself for easy transportation of information. There are no membrane bound organelles within the nucleus but there are several subnuclear bodies like DNA,RNA, nucleolus, and ribosome. The nucleolus is the most prominent part of the nucleus in a cell. The nucleolus produces ribosome, which then leaves the nucleus where it is very important in protein synthesis.