Multiple Choice
Which of the following best describes a protein as a biological molecule?
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4. Biomolecules
Introduction to Biomolecules
Multiple Choice
Why are triacylglycerols the major form of stored energy in the body instead of glucose?
A
Glucose is more stable and less reactive than triacylglycerols.
B
Glucose is primarily used for structural purposes in cells.
C
Triacylglycerols are more easily transported in the bloodstream than glucose.
D
Triacylglycerols provide more energy per gram than glucose.
Verified step by step guidance1
Understand the role of triacylglycerols and glucose in energy storage: Triacylglycerols are a type of lipid that serve as a major form of energy storage in the body, while glucose is a carbohydrate primarily used for immediate energy needs.
Compare the energy content: Triacylglycerols provide more energy per gram than glucose. This is because lipids have a higher proportion of carbon-hydrogen bonds, which release more energy when broken down during metabolism.
Consider the storage efficiency: Triacylglycerols are stored in adipose tissue and can be packed densely without water, making them a more efficient form of energy storage compared to glucose, which is stored as glycogen and requires water for storage.
Evaluate the transport and usage: While glucose is soluble in water and easily transported in the bloodstream for quick energy, triacylglycerols are transported in the form of lipoproteins and are used for long-term energy needs.
Conclude with the primary reason: The major reason triacylglycerols are the preferred form of stored energy is their higher energy yield per gram, making them more efficient for long-term energy storage compared to glucose.
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