Multiple Choice
Which polysaccharide is stored as an energy source in the body of animals?
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4. Biomolecules
Carbohydrates
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How does the amount of energy stored in carbohydrates compare to the energy stored in body fat?
A
Carbohydrates and body fat store the same amount of energy per gram.
B
Carbohydrates store less energy per gram than body fat.
C
Carbohydrates store more energy per gram than body fat.
D
Carbohydrates do not store any energy.
Verified step by step guidance1
Understand the basic function of carbohydrates and fats in energy storage. Carbohydrates are primarily used for short-term energy needs, while fats are used for long-term energy storage.
Learn about the energy content of macronutrients. Carbohydrates typically provide about 4 kilocalories per gram, whereas fats provide about 9 kilocalories per gram.
Compare the energy density of carbohydrates and fats. Since fats provide more kilocalories per gram, they are more energy-dense than carbohydrates.
Consider the biological reasons for the difference in energy storage. Fats are more reduced than carbohydrates, meaning they have more hydrogen atoms relative to oxygen, which allows them to store more energy.
Conclude that carbohydrates store less energy per gram than body fat, based on the energy content and biological structure of these macronutrients.
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