Comparing ester bonds in lipids

Steps:

• Identify triglyceride structure: glycerol esterified to three fatty acids, forming three ester bonds.
• Recall common lipids with fewer ester bonds: monoglycerides have one fatty acid linked by one ester bond.
• Assume molecule X is a monoglyceride based on lipid classification.
• Match options: only C correctly states one ester bond for X versus three for triglyceride.

Why C is correct:

• Triglycerides contain three ester linkages by definition, while monoglycerides have one, distinguishing simple lipid structures.

Why the others are wrong:

• A: Fatty acid saturation varies in both; triglycerides often have unsaturated chains, not exclusively saturated.
• B: Both have ester bonds; no lipid like X lacks them entirely compared to triglyceride's three.
• D: Fatty acid count matches ester bonds in glycerides, so X with one ester would have one fatty acid, not two.

Final answer: C