Carbohydrates are more easily metabolized than lipids. However, on a gram-for-gram basis, lipids provide cells with more-]
A,nitrogen.
B.proteins.
C.structure.
D.energy.
Explanation: On a gram for gram basis lipids have the highest energy yield of all the food sources. They yield 9 kcal of energy per gram while carbohydrates and proteins yield only 4 kcal of energy per gram.
