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selected_slides - Copies of Selected Slides Cytoskeleton...

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Copies of Selected Slides Cytoskeleton Chp. 6 Diffusion across membranes Chp 7 Eukaryotic Cell Division Chp.12 Biochemistry of DNA replication Chp. 16 Genes Chp.17 Protein Synthesis Chp.17 Viruses Chp.19 Gene expression in Differentiation and Oncogenesis Chp.18 Cytoskeleton Chp. 6 Cytoskeleton Composed of a network of assorted fibres. Fibres are made by the assembly of many subunits of certain proteins. Assembly involves non-covalent bonds. Cytoskeleton: 1. provides mechanical support. 2. enables cell to change shape because protein fibres can disassemble and reassemble. (subunit principle). Considerable rearrangement takes place during cell division. 3. provides order to the cell by giving it defined structure and anchoring organelles in space. 4. transports vesicles, components of cells, organelles. 5. Involved in muscle contraction (eg actin and myosin) and even motility of cell itself. Regarding Table 6.1 You should know some of the functions of Microtubules and Microfilaments (not Intermediate Filaments), especially chromosome movement and muscle contraction. Details of structure not required except that MT are made of tubulin protein subunits and Microfilaments are made of actin protein subunits. Cilia and Flagella Whip like structures used by cells to move through their environment. eg animal and plant sperm cells.
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Both composed of MT in specialised array but flagella sperm undulates, cilia beat like oar. Diffusion across membranes Chp 7 The inward rate of diffusion = [Ao] k 1 ; The outward rate of diffusion = [Ai] k -1 ; 1 & k -1 are rate constants for diffusion in & out respectively. (Rate constants depend on the nature of the solute and the membrane.) The Net rate of inward diffusion = [Ao] k 1 - [Ai] k -1 At equilibrium: [Ao] k 1 = [Ai] k -1 Often when considering diffusion, k 1 = k -1 so you can talk simply about a conc. gradient {and so under these conditions the Net rate of inward diffusion = ([Ao] - [Ai]) k 1 } Eukaryotic Cell Division Chp.12 A. Preparation for cell division. B. Cell Cycle C. Mitosis - the process of nuclear division D. Regulating the sequence of events (especially ensuring each daughter cell acquires a complete set of genes and chromosomes). E. Controlling the decision whether to divide and when to divide. Cells can be programed or instructed: 1) to die 2) to become specialized cells and never divide again: muscle, nerve cells, etc. 3) to divide fairly continuously e.g.: adult stem cells divide
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This note was uploaded on 12/16/2009 for the course BIOLOGY 2112 taught by Professor Rappaport during the Fall '08 term at Temple.

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selected_slides - Copies of Selected Slides Cytoskeleton...

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