Which of the following statements are true of the structure of organic molecules?
a. Fatty acids are subunits of phospholipids
b. amino acids are the subunits of nucleic acids
c.the subunits of polysaccharides are monosaccharides
d. nucleotides are large molecules mad of DNA or RNA
e. Glucose is the subunit of glycogen
f. Glycerol is a subunit of steroids