Human hormones testosterone and estrogen are considered lipids. What could be the reason for this?
Testosterone and estrogen are steroid hormones. The hormone part of the name refers to their biological function.
Testosterone and estrogen are derived from cholesterol which is a sterol lipid.
Hence they are lipids. Like all lipids they are fatty chain molecules that are insoluble in water and soluble in non polar solvents.
Steroids have a basic carbon structure with four fused rings. The different functional groups attached to the rings make them different from each other.