* Nuclear envelope: A double membrane that encloses the nucleus and separates it from the cytoplasm. It has nuclear pores that allow for the passage of molecules between the nucleus and cytoplasm.
* Nucleolus: A dense, spherical structure within the nucleus that is responsible for ribosome biogenesis.
* Chromatin: The complex of DNA and proteins that make up the chromosomes. It is organized into a hierarchy of structures, including nucleosomes, solenoids, and loops.
* Nucleoplasm: The gel-like substance that fills the space between the nuclear envelope and the chromatin. It contains enzymes, nucleotides, and other molecules involved in nuclear function.
These components work together to carry out the essential functions of the nucleus, including:
* Storing and protecting the genetic information of the cell.
* Replicating DNA and transcribing genes into RNA.
* Assembling ribosomes.
* Regulating gene expression.
