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- A netlike membranous complex of superposed flat saccules with vesicles detaching from the extremities seen in electronic microscopy. What is the observed structure? What is its biological function?Proteoglycan aggregates in tissues form hydrated, viscousgels. Can you think of any obvious mechanical reason whytheir capacity to form gels is important to cell function?[Hint: Liquid water is virtually incompressible.]It seems paradoxical that a lipid bilayer can be fluid yet asymmetrical. Explain.
- Many transmembrane proteins are oligomeric, with several identical subunits. The oligonmers are usually found to have some form of C, symmetry, rather than D, or any higher order. Suggest a reason for this observation.What typical structure[s] is/are found in integral membrane proteins – how do they span themembrane?Assisted protein folding is facilitated by a specific class of proteins called _______.
- Many transmembrane proteins are oligomeric, with several identical subunits. The oligomers are usually found to have some form of Cn symmetry, rather than Dn or any higher order. Suggest a reason for this observation.The glycosaminoglycan polysaccharide chainsthat are linked to specific core proteins to form the pro-teoglycan components of the extracellular space arehighly negatively charged. How do you suppose thesenegatively charged polysaccharide chains help to estab-lish a hydrated gel-like environment around the cell? Howwould the properties of these molecules differ if the poly-saccharide chains were uncharged?Glycophorin, a protein in the plasma membraneof the red blood cell, normally exists as a homodimer thatis held together entirely by interactions between its trans-membrane domains. Since transmembrane domains arehydrophobic, how is it that they can associate with oneanother so specifically?
- The Consequences of Ribosome Complexity Eukaryotic ribosomes are larger and more complex than prokaryotic ribosomal. What advantages and disadvantages might this greater ribosomal complexity bring to a eukaryotic cell?19:20 uil 4G A docs.google.com Observe the figure below and answer the following questions. Does "end A" represent the plus or the minus end? Explain. "A" End Your answer Identify the structure shown in this figure and indicate one of its functions.Cell Membrane Coloring WorksheetComposition of the Cell Membrane & FunctionsThe cell membrane is also called the ___PlasmaMembrane____________ membrane and is made of a phospholipid_____________. The phospholipids have a hydrophilic (waterattracting) __________ and two hydrophobic (water repelling) ____________. The head of a phospholipid is made of an alcohol and__________ group, while the tails are chains of ____________.Phospholipids can move _______________ and allow water and other_________ molecules to pass through into or out of the cell. This isknown as simple ____________ because it does not require__________ and the water or molecules are moving __________ theconcentration gradient. SKETCH AND LABEL a phospholipid coloringthe heads red and the tails blue.PHOSPHOLIPID Another type of lipid in the cell membrane is ______________that makes the membrane more fluid. Embedded in the phospholipidbilayer are __________ that also aid in diffusion and in cellrecognition. Proteins…