Cholesterol ( see picture) 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 contribute to the stiffening (rigidity) or the fluidity of a membrane? why or why not?

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Q: Why can’t triacylglycerols be significant components of lipid bilayers?

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Q: Describe the similarities and differences between a liposome and a micelle.

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Q: Figure 1 shows the melting temperature vs chain length of stearic acid, i.e. octadecanoic acid. 90 -…

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Q: Which portion of a glycerophospholipid molecule forms the interfacial region of a lipid bilayer? O…

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Q: Describe the structural and functional properties of lipid rafts

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Q: Complete hydrolysis of a glycerophospholipid yields glycerol, two fatty acids (16:1(Δ9) and 16:0),…

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Q: Sphingolipids differ from phosphoglycerides because? A. sphingolipids never have the phosphodiester…

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Q: A structural element common in all glycerophospholipids is:

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Q: Lipid bilayers are said to behave like two-dimensional fluids. What does this mean?

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Q: What advantage do unsaturated phospholipids have over saturated phospholipids in the lipid bilayer?

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Q: Glycolipids are nonionic lipids that can orient themselves unto bilayers as phospholipids do. They…

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Q: What properties define the phospholipids that make up the lipid bilayer?

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Metabolic pathways

Metabolism is defined as the group of life-supporting, enzyme-mediated chemical reactions in organisms. A metabolic pathway is a set of these chemical reactions that involve anabolism (synthesis of complex biomolecules) and catabolism (breakdown of biomolecules into small molecules) that occur inside a cell. Metabolites are the reacting substances, products, and intermediate substances of an enzymatic process that are altered by a series of chemical events catalyzed by enzymes.