A Level Biology Practice Exam

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Which substance is found in triglycerides?

  1. Fructose

  2. Glycogen

  3. Glycerol

  4. Glucose

The correct answer is: Glycerol

Triglycerides are a type of lipid made up of molecules that consist of glycerol and fatty acids. The structure of triglycerides involves one glycerol molecule bonded to three fatty acid chains, which contribute to the energy-storing properties of fats. Glycerol serves as the backbone of the triglyceride molecule, forming the attachment point for the fatty acid chains. While glucose, fructose, and glycogen are all carbohydrates, they play different roles in metabolism and do not form part of the structure of triglycerides. Thus, glycerol is the correct substance found in triglycerides, highlighting its significance in the formation of this essential type of fat.

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