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Hello students in this question there are many sub questions so let us answer the first the major categories of lipids are waxes, phospholipids, steroids and fats.
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Waxes are usually found on leaves and in feathers and what it does is that it acts as a water repellent on the leaf surface and on the feathers so this is a major function that waxes plays a role in the organism whereas phospholipids are a major component of the plasma membrane.
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All cell membrane and the plasma membrane are made up of phospholipids and they are arranged into a lipid by layer.
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Whereas steroids have a major role in growth, development, reproduction, and the function of fats is that, first of all, it is a reservoir of energy.
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And secondly, it acts as an insulation and it also acts as a shock absorber.
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So these are the four major categories of lipids and their functions.
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Then next, the physical characteristic common to waxes, phospholipids, steroids, fats and oil is they are all lipids and are hydrophobic.
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That is, they repel water.
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Then next, fats and oils are made up of triglycerides.
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These triglycerides contain esters of glycerol, and fatty acids...