Describe the main classes of lipids and their structural characteristics. Provide detailed examples for each class, including their biological significance.

Lipids are a diverse group of hydrophobic or amphiphilic molecules that play key roles in biological systems. They are primarily involved in energy storage, membrane structure, and signaling processes. The main classes of lipids are triglycerides, phospholipids, glycolipids, sphingolipids, and sterols, each with unique structural features and biological functions.

1. Triglycerides (Triacylglycerols):
   Triglycerides are the most common form of lipid and are primarily used for energy storage. Structurally, they consist of a glycerol backbone attached to three fatty acid chains via ester bonds. The fatty acids may be saturated or unsaturated, affecting the properties of the triglyceride. Saturated fatty acids lack double bonds between carbon ___ ___ _____ _______ _______.
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