Answer:
Fat molecules contain more energy-containing bonds than simple sugars.
Explanation:
-The four main macromolecules in cells made largely from C, O, H, and N are Carbohydrates, Lipids, Proteins, and Nucleic Acids.
-Fat contains twice the energy-rich (C-H) bonds as glucose, they store twice as much energy as glucose and also fats produce twice as many calories (9 kcal/gm vs 4 kcal/gm) when burned. However, twice as much energy is needed to burn off a pound of excess fat as compared to glycogen.
-Gram for gram, fats provide more energy than carbohydrates. The reason for this is the amount of oxidation that takes place as these compounds are converted to carbon dioxide and water. Carbon for carbon, fats require more oxidation to become CO2 and H2O than do carbohydrates.
