Nucleus Rachel Gagliardo, Paul Trujillo, Tim Lee, Carolina Charvet The Nucleolus is the part of the Nucleus that provides structure. It is also the place where Ribosomal RNA is built. It is made out of Nucleic acids and Proteins, and consists of 3 layers, the Fibrillar center, the dense fibrillar component, and the granular component. Found on http://en.wikipedia.org/wiki/Nucleolus, http://leavingbio.net/Cell%20Structure_files/Cell%20Structure_files/image016.jpg Chromatin • The chromatin is found inside the nucleus of cells • The major proteins involved in chromatin are histone proteins. DNA is packaged into chromatin thereby decreasing the size of the molecule and allowing the cell to control the chromatin-packaged genes. • Both plant and animal cells have chromatin Chromosomes • Chromosomes are located in the middle of the Nucleus • The Function of the chromosomes is to carry strands of DNA. Some chromosomes can decide the sex of the offspring • There are Different types of Chromosomes. However in plants and animals the chromosome shape is the same. Importance Of Chromosomes Nuclear Envelop • • • Location: It surrounds the nucleus. Structure: It is a double lipid bilayer. The nuclear envelope has two membranes. It has nuclear pores that regulate the exchange of materials between the nucleus and the cytoplasm. The membrane its also consist of ribosomes. Function: serves as a physical barrier, separating the contents of the nucleus (DNA in particular) from the cytosol (cytoplasm). It plays a role in the organization and transcriptional activity of chromatin.