Cholesterol is a type of

Cholesterol is classified as a lipid because of its unique molecular structure and solubility characteristics [1]. Unlike carbohydrates, proteins, or nucleic acids, cholesterol is a hydrophobic molecule, meaning it is insoluble in water but soluble in organic solvents. Structurally, it is a sterol consisting of a hydrocarbon tail, a central sterol nucleus made of four hydrocarbon rings, and a hydroxyl group [1]. It serves critical biological functions, including maintaining the structure and fluidity of cell membranes and acting as a precursor for the synthesis of steroid hormones like cortisol and estrogen. Because of its hydrophobic nature, it must be packaged with proteins to form lipoproteins for transport through the bloodstream [1]. Lipids, including fats and cholesterol, are one of the four major classes of biological macromolecules essential for life.

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1. [1] https://www.ncbi.nlm.nih.gov/books/NBK513326/