For each statement below, determine whether it accurately describes the similarities or differences between triacylglycerols and glycerophospholipids. Select all that apply.
I. Both triacylglycerols and glycerophospholipids contain a glycerol backbone.
II. Triacylglycerols have two fatty acid chains esterified to the glycerol backbone, while glycerophospholipids have three fatty acid chains.
III. Glycerophospholipids include a phosphate group and an additional polar head group, while triacylglycerols do not.
IV. Triacylglycerols are primarily involved in energy storage, whereas glycerophospholipids are primarily involved in cell membrane structure.

• A. I and III
• B. I and IV
• C. I, III, and IV
• D. I, II, III, and IV

Answer: (C)