The nucleus is the most prominent cellular organelle, and contains the cell's database or genome, which is encoded in DNA. It comprises the following components: Nuclear envelope.
Outer membrane, which is continuous with the endoplasmic reticulum membrane.
Pore complex: nuclear pores connect the inner and outer membranes. This is a gated channel through which ribonucleoproteins are transported to the cytoplasm.
Nucleolus: which is associated with ribonucleic acid (RNA) processing and ribosome synthesis. It is not bounded by a membrane. Fibrous matrix: the structural skeleton of the nucleus.
Deoxyribonucleic acid (DNA)-protein complex: The nucleus contains all chromosomal DNA, the genetic material of the cell.
The functions of the nucleus include: Synthesis of new DNA, involving DNA replication during mitosis. Synthesis of ribosomal RNA, messenger RNA, and transfer RNA. The nucleolus is the site of messenger RNA transcription and processing, and of ribosome assembly. A key role in cell division.
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