1.only an unsaturated fatty acid esterified to a glycerol molecule to which a phosphate the group is also attached
2. only a saturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
3. an unsaturated or saturated fatty acid esterified to a phosphate molecule to which a glycerol molecule is also attached
4.an unsaturated or saturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached