Which would be a property of all the major types of lipids in this membrane? * They would have polar heads and non-polar tails. They would be composed of five-carbon units. They would be saponifiable in base and hydrolyzed in acid. They would be joined to each other through covalent bonds.
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- Compare the hydrophobic forces that hold a membrane protein in the lipid bilayer with those that help proteins fold into a unique three-dimensional structure.It seems paradoxical that a lipid bilayer can be fluid yet asymmetrical. Explain.Draw the structure of these phospholipids:- a cephalin formed from two molecules of stearic acid
- Draw the basic structure of a lipid bilayer and label thehydrophilic and hydrophobic regions. Why is the cytoplasmicmembrane a good permeability barrier?Draw a sketch of a lipid bilayer, the structure that forms when a lipid such as phosphatidyl serine is dissolved in water.How is the structure of cholesterol similar to other membrane lipids? How is it different? Based on the figure below, suggest a function for cholesterol in biological membranes.
- If you place phospholipids in an oil-based solution, would they still self-assemble into a bilayer? If so, describe its structure.Cholesterol ( above below ) has a fused four – ring core and is part of body membranes. The -OH group on C-3 is the polar head, and the rest of the molecule provides the hydrophobic tail that does not fit into the zigzag packing of the hydrocarbon portion of the saturated fatty acids. Considering this structure, does cholesterol contributes to the stiffening (rigidity) or the fluidity of a membrane? Why or why not?What properties define the phospholipids that make up the lipid bilayer? Select all that apply. A. Nonpolar, hydrophobic hydrocarbon tails B. Polar, hydrophilic phosphate heads C. Nonpolar, hydrophobic phosphate heads D. Polar, hydrophilic hydrocarbon tails
- Why are phospholipds arranged tail to tail instead of head to head on lipid bilayers.There is a long chain of amino acids with long sections that are mostly polar, alternating with long sections that are nonpolar. How would this chain be organized if it were destined to become a transmembrane protein? A cytoplasmic protein?The structure of a lipid bilayer is determined by the particular properties of its lipid molecules. What would happen if A. Phospholipids had only one hydrocarbon tail instead of two?B. The hydrocarbon tails were shorter than normal, say, about 10 carbon atoms long?C. All of the hydrocarbon tails were saturated?D. All of the hydrocarbon tails were unsaturated?E. The bilayer contained a mixture of two kinds of phospholipid molecules, one with two saturated hydrocarbon tails and the other with two unsaturated hydrocarbon tails?F. Each phospholipid molecule were covalently linked through the end carbon atom of one of its hydrocarbon tails to a phospholipid tail in the opposite monolayer?