BSC 1005 Lecture Notes - Lecture 5: Pencil, Lipid Bilayer, Cell Junction
Document Summary
Key terms: nucleus, prokaryotes, eukaryotes, plasma membrane, cytoplasm, organelles, endomembrane system, cytoskeleton, cell wall, plastids, cell junctions. The smallest unit that still retains the characteristics of life. All organisms are composed of one or more cells. There are two major types of cells distinguished by their internal organization. There is no separation between their dna and the rest of the cell. Dna is coiled in to a nucleoid region. The dna is organized and contained within the nucleus. The most conspicuous organelle that houses the cell"s dna. Instructions for building proteins are contained in dna. nucleoli (sing = nucleolus) containing rna and proteins. Dna and associated proteins in the form of chromatin (46 threads in most human cells) Dna and associated proteins in the form of chromatin nuclear matrix : viscous fluid inside the nucleus nuclear envelope. Cytoplasm: everything enclosed by the plasma membrane except the nucleus. Includes membrane bound organelles and the endomembrane system.
