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What are the main types of lipids?

The main types of lipids are triglycerides (fats and oils), phospholipids, waxes and steroids.

What is the structural formula of glycerol? To which organic function do these molecules belong?

Glycerol is a linear chain of three carbons; the central carbon is bound to one hydroxyl radical and to one hydrogen and the two other carbons in the extremities are bound to a hydroxyl radical and to two hydrogens. Spatial sides of the hydroxyls are the same.

How are triglycerides made?

Triglycerides, fats or oils, are made of three molecules of fatty acids bound to one molecule of glycerol. Hydroxyls of each one of the three fatty acids and each hydrogen of the hydroxyls of the glycerol bind to form three molecules of water that are liberated.