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A membrane enclosed orgnanelle that contains the chromosomes. It controls and regulates the activity of the cell.


This is the largest nuclear organelle and is a specialized region in a cell nucleus. Here RNA is synthesized and assembled and later transported out of the nucleus through the nuclear pores for protein synthesis in the cytoplasm.


Humans and nearly all other species carry their genetic information in DNA. This DNA is packaged as chromatin. Chromatin fibers are coiled and condensed to form chromosomes within the nucleus of eukaryotic cells.

Nuclear envelope

The inner and outer nuclear membranes are two membranes that enclose the nucleus and protect the cell's DNA from the chemical reactions occurring elsewhere in the cell. The outer membrane is continuous with the endoplasmic reticulum.

Nuclear pore

The nuclear membrane has a variety of protein-lined channels (called the nuclear pore complex) that enable the selective passage of specific molecules, such as proteins and nucleic acids, into and out of the nucleus.


The nucleoplasm is a gel-like substance in the central area of the cell whose main function is to store DNA and enable DNA-dependent processes such as transcription, gene expression, and DNA repair to occur in a controlled environment.