Fats and oils can be referred to by the general term \_\_\_\_\_\_\_\_ because \_\_\_\_\_\_\_\_\_\_\_\_.
triglycerides; they are formed when any one of the three functional groups of glycerol reacts with a fatty acid
soaps; they can undergo saponification reactions
phospholipids; they are formed when any one of the three ester groups is replaced by a phosphate group
triacylglycerols; they are formed by reaction of 1,2,3-propanetriol with three fatty acids
steroids; they have a specific tetracyclic ring structure