Lipid

In conclusion: you learned today the definition of lipids which are macro biomolecule that composed from heterogeneous groups; the structure of lipids which describe the 2 heterogeneous groups ( the polar and non-polar portions); then the types of lipids (fats) that divided into 2: saturated (single bonds), and unsaturated (double and triple bonds), also some forms of lipids (fatty acids and steroids) and finally the functions of lipids.