Chapter 8 Lecture Notes Lipids 1 Chapter 8 Lecture Notes: Lipids Educational Goals 1. Know the factors that characterize a compound as being a lipid. 2. Describe the structure of fatty acids and explain how saturated, monounsaturated, and polyunsaturated fatty acid structures differ from one another. 3.
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Cell membranes are waterproof due to the lipid portion of the membrane bilayer. Cell membranes are made of a phospholipid bilayer which has proteins... See full answer below.
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Testosterone is an example of a steroid. Steroids that have a hydroxyl group at C3 are called sterols (e.g., cholesterol). Other lipids: Some lipids have structures that do not fit into the other classes. For example, retinol, or vitamin A (see figure), is a polyisoprenoid that our bodies convert to retinal, which is a photoreceptor in the rod ...
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First lipids stores energy. Second they are parts of biological membranes and waterproof coverings. They send and serve as messages. Finally they absorb vitamins.
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Lipids are composed of three fatty acids (usually) covalently bonded to 3-carbon glycerol. The fatty acids are composed of CH 2 units and are hydrophobic/not water-soluble. Some examples of fatty acids are shown in Figure 1. Figure 1. Saturated (top and middle) and unsaturated (bottom) fatty acids.
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Lipids also provide insulation from the environment for plants and animals. For example, they help keep aquatic birds and mammals dry because of their water-repelling nature. Lipids are also the building blocks of many hormones and are an important constituent of the plasma membrane. Lipids include fats, oils, waxes, phospholipids, and steroids.