BIOB10H3 Lecture Notes - Lecture 10: Disaccharide
17 Jun 2011
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What is the cytoskeleton: extensive protein network. Made on free ribosomesin the cytoplasm, no targeting sequence: three main components: Cytoskeleton -functions: scaffold structural support and cell shape, i nternal framework organize organelles within a cell, movement directs cellular locomotion and movement of materials within the cell, machinery for cell division. Key to cystoskeletal functions: structure and support, intracellular transport, contractility, spatial organization. Lamins inner nuclear membrane cytoskeleton: determines shape of nuclear envelope. Keratin: keratin: main protein of skin cells (keratinocytes, skin is made of many layers constantly dividing. Makes huge amounts of keratin: as skin cells are pushed towards surface they undergo apoptosis ; programmed cell death www. notesolution. com, cell dies leaves epidermis covered with a dead, waterproof layer of keratin protein: Cornified cells: plasma membrane forms boundary between a cell and its non-living environment, but cells must respond to external stimuli. Interact in specific ways with other cells and extracellular materials: i n multicellular animals.
