Biology 9700 · AS & A Level · Carbohydrates and lipids

Carbohydrates and lipids — practice question

Cocoa butter is composed of three triglycerides. The fatty acids used to form these triglycerides are oleic acid (O), palmitic acid (P) and stearic acid (S). The triglycerides present in cocoa butter are POS, SOS and POP. The chemical structure of the triglyceride POS is shown alongside a schematic diagram of POS. Which statement is correct?

  • ATriglyceride POP contains two unsaturated fatty acids joined by ester bonds to glycerol.
  • BTriglyceride POS contains two less carbon atoms than triglyceride POP.
  • CTriglyceride SOS contains four more carbon atoms than triglyceride POP.
  • DTriglyceride SOS contains two saturated fatty acids joined by hydrolysis to glycerol.

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