Nucleus

Structure:

1. Complex Double Membrane (Nuclear Envelope)
2. Nuclear Pores
3. Nuclear Lamina
4. Nucleolus

Function:

1. Protection of DNA and Chromosomes
2. Allow entry and exit of products and reactants, respectively
3. Cytoskeletal-like structure which maintains the integrity of the nucleus and keeps chromosomes in their "assigned" place
4. House for manufacturation of RNA molecules into Ribosomal subunits