By Amanda Karzenoski & Tiffany Race

Found in plant and animal cells Sets Eukaryotic cells apart from prokaryotic cells Largest & most easily seen organelle Spherical structure surrounded by a double membrane Contains genetic information

Nucleus Many nuclei exhibit a dark staining zone called the nucleolus which is a region where intensive synthesis of ribosomal RNA is taking place.

Nucleolus Site of genes for rRNA synthesis Synthesis of rRNA and ribosome assembly Is composed of DNA, RNA, and Protein Disappears during cell division but reappears in the final stage of mitosis

Questions 1. regulates the passage of molecules between the nucleus and cytoplasm A. Chromatin B. Nuclear Poles C. Ribosome's D. Protein 2. How is DNA organized in the nucleus? A. It is grouped into 4 and stored in the nucleoplasm B. It is lined up between the double layered membrane known as the nuclear envelope C. There is no specific organization, it floats freely throughout the cell until cellular division occurs D. In a complex structure called chromatin