The differences refer to chemical structure and functions:
1-Structure:
Fats:These are simpler than phospholipids. They are all triacylglycerols.
Steroids:The most (in)famous steroid is cholesterol,and the main structure of
steroids is from cholesterol (cholic acid)
2-Function
Fats:They are best known for forming the cell structure in our cells. The so called lipid bi-layer.
Steroids:they regulate pregnancy, blood pressure, inflammation and sexual development.
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