Final answer:
Lipids are hydrophobic because their molecules are nonpolar and do not dissolve in water. Examples of hydrophobic lipids include triglycerides and phospholipids. The hydrophobic nature of lipids is important for their various functions in the body.
Step-by-step explanation:
Lipids are hydrophobic because they consist of molecules that are largely composed of hydrocarbon chains. Hydrocarbon chains are nonpolar and therefore do not have an attraction to polar molecules like water, which is why lipids do not dissolve in water.
One example of a lipid that is hydrophobic is triglycerides, which are composed of three fatty acids attached to a glycerol molecule. Another example is the cell membrane, which is primarily made up of phospholipids. The hydrophobic tails of phospholipids create a barrier that prevents water-soluble substances from freely passing through the cell membrane.
Overall, the hydrophobic nature of lipids is essential for their functions in the body, such as providing insulation, storing energy, and forming protective barriers.
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