Nucleus细胞核 Nuclear membrane:consists of a pair of unit membranes. Nuclear membrane contains pores. Nucleolus:an area rich in RNA that is the site of ribosomal RNA synthesis.核仁 Ribosomal proteins synthesized in the cytoplasm are transported into the nucleolus and combined with rRNA to form the small and large subunits (they are then exported to cytoplasm). Chen Feng.Shanghai Jiao Tong UniversityChen Feng, Shanghai Jiao Tong University Nucleus细胞核 Nuclear membrane: consists of a pair of unit membranes. Nuclear membrane contains pores. Nucleolus: an area rich in RNA that is the site of ribosomal RNA synthesis.核仁 • Ribosomal proteins synthesized in the cytoplasm are transported into the nucleolus and combined with rRNA to form the small and large subunits (they are then exported to cytoplasm)