12/16/2023 0 Comments Fluid mosaic model downloadMost methods require purification and observation in aqueous environments alien to the molecular design of a membrane, and so the field had to rely on oversimplified views that still dominate the texts and teaching in this area. Perhaps this is understandable in view of the technical hurdles that working with them presents. Active Transport a.) Dimpling on the exterior of cell membrane b.) Vesicle forms surrounding extracellular fluid c.) Movement of vesicle & fluid into the cell 1.) Pinocytosis a.) Formation of cytoplasmic extensions, pseudopodia b.) Particle or organism surrounded c.) Vesicle formed & moved into the cell d.) Amoeba sp, monocytes, & neutrophils 2.) Phagocytosis 2.Given their biological importance, membranes have been surprisingly neglected by biochemists until recently. Energy negative 1.) Uses transport proteins activated by ATP 2.) Individual molecules or ions, Na+/K+ pump a. Diffusion 4.) Isotonic a.) No net movement of water into or out of the cell 4.) Isotonic 5.) Hypotonic a.) Plasmolysis- plant cell’s plasma membrane pulling away from its cell wall as the central vacuole loses H2O b.) Crenation- the shrinking of cells in a hypertonic solution, especially RBCs, plasma membrane drapes over the cytoskeleton 6.) Hypertonic a. Energy Neutral 1.) Net random movement of a substance from areas of greater concentration to areas of lesser concentration 2.) Dissolved gases (O2 & CO2) & lipid soluble molecules across cell membrane 3.) Ions across cell membrane through channel proteins 4.) Factors affecting diffusion a. Energy negative- movement against the concentration gradient B. Energy neutral (Passive transport)- movement with a concentration, electrical, or pressure gradient 3. Movement of material into & out of the cell through the plasma membrane 2. Embedded proteins shift through the bilayer A. Plasma membrane is a phospholipid bilayer with embedded proteins, cholesterol, glycolipids, & glycoproteins 3. Download Plasma Membrane, Fluid Mosaic Model, Cell Transport | BIO 1040 and more Biology Study notes in PDF only on Docsity!A.
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