BSC 1005 Lecture Notes - Lecture 5: Cell Membrane, Endomembrane System, Nuclear Membrane
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: prokaryotic cells cells that don"t have a distinct nucleus. Eukaryotic cells cells with a distinct nucleus. Do not have a nucleus: pro=early/first/beginning, karyon=nucleus. There is no separation between their dna and the rest of the cell: ex. Organelles comparable to eukaryotic cells are absent: organelle membrane-bound structures with a specific function. Dna is coiled in to a nucleoid region. The dna is organized and contained within the nucleus. Different membrane-bound organelles are present: ex. 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.
