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The type of lipids found in the membranes of most cells are:

  1. Steroids

  2. Glycolipids

  3. Phospholipids

  4. Waxes

The correct answer is: Phospholipids

Phospholipids are found in the membranes of most cells due to their unique structure, which consists of a hydrophobic ("water-fearing") fatty acid tail and a hydrophilic ("water-loving") phosphate head. This structure allows phospholipids to form a protective barrier around cells, regulating the flow of molecules in and out. Steroids, such as cholesterol, are also found in cell membranes but in lower quantities compared to phospholipids. Glycolipids and waxes are not typically found in cell membranes and serve different functions in the body, such as insulation and waterproofing. Therefore, option C is the most accurate answer.