Why are triacylglycerols used in the human body for energy storage?
Correct answer: C. The carbon atoms of the fatty acid chains are highly reduced and therefore yield more energy upon oxidation
- A. They are highly hydrated and therefore can store lots of energy
- B. They always have short fatty acid chains for easy access by metabolic enzymes
- C. The carbon atoms of the fatty acid chains are highly reduced and therefore yield more energy upon oxidation
- D. Polysaccharides, which would actually be a better energy storage form, would dissolve in the body
Explanation
The correct answer is C: The carbon atoms of the fatty acid chains are highly reduced and therefore yield more energy upon oxidation. Triacylglycerols, or triglycerides, serve as the primary form of energy storage in the human body due to several factors:High Energy Density: The fatty acid chains in triglycerides contain carbon atoms that are highly reduced, meaning they are bonded to a larger number of hydrogen atoms. This structure allows triglycerides to release a significant amount of energy during oxidation, making them more energy-dense than carbohydrates or proteins.Efficient Storage: Being hydrophobic, triglycerides can be stored in an anhydrous form within adipose tissues, which optimizes space and energy storage compared to carbohydrates that are more hydrated.Prolonged Energy Release: Triglycerides can be broken down over time into glycerol and fatty acids, providing a sustained energy supply through metabolic processes like lipolysis and beta-oxidation, ideal for prolonged energy needs.In contrast, the other options are incorrect because:Option A incorrectly states that triacylglycerols are highly hydrated, which is not true; their hydrophobic nature actually aids in energy storage.Option B misrepresents the nature of fatty acid chains, as they can vary in length and not all are short-chain.Option D inaccurately suggests that polysaccharides would be a better energy storage form, ignoring the efficiency and density benefits of triglycerides.
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