Structure and Function of Biological Macromolecules

AP Biology· difficulty 2/5

Triglycerides serve as long-term energy storage primarily because

A
$Their nitrogen-rich tails store energy more densely than sugars$
B
$Their highly oxidized C-O bonds release ATP faster than glycogen$
C
$Their polar ester linkages dissolve readily in cytosolic water$
D
$Their highly reduced C-H bonds release more ATP per gram than carbohydrates$
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Explanation

Lipids are more reduced (more C-H bonds) than carbs/proteins, so full oxidation releases ~9 kcal/g vs ~4 kcal/g for carbohydrates.

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