True or false: Cholesterol is a lipid that is soluble in blood.

Cholesterol is classified as a lipid, and while it is an essential component of cell membranes and serves as a precursor for steroid hormones and bile acids, it is not soluble in blood. Instead, cholesterol is hydrophobic, meaning it does not dissolve well in the watery environment of blood plasma. Due to this property, cholesterol is transported through the bloodstream within lipoproteins, which are complexes of lipids and proteins that enable the solubilization and transport of hydrophobic molecules in the aqueous environment of the body.

The assertion that cholesterol is soluble in blood is therefore false, as it must associate with these lipoproteins to effectively circulate. This fundamental characteristic of cholesterol is crucial for understanding its role in the body and its implications for health, particularly in relation to cardiovascular disease and lipid metabolism.