Section: Chemical and Physical Foundations of Biological Systems

32) Triacylglycerides consist of I. A ribose backbone II. a glycerol backbone III. three phosphodiester linkages IV. three ester linkages

1. I and III
2. II only
3. II and III
4. II and IV

Triacylglycerides consist of a glycerol backbone bonded to three fatty acids. The bond between each acid and the glycerol is an ester group. Phosphodiester linkages are found in DNA. I. A ribose backbone II. a glycerol backbone III. three phosphodiester linkages IV. three ester linkages a) I and III, incorrect, Glycerol, not ribose, forms the backbone of triacylglycerides. b) II only, incorrect, There are three ester linkages in addition to the glycerol backbone. c) II and III, incorrect, Phosphodiester linkages are found in DNA not triacylglycerides. d) II and IV, correct.