16. In metabolism，glucose is degraded to CO2 and water. The carbon dioxide is produced in (A) the red blood cells. (B) the citric acid cycle. (C) glycolysis. (D) the electron transport chain.

3. If a total of 2000 kcal were consumed (250 grams of carbohydrates, 66 grams of fat, and 102 grams of protein), what percentage of energy comes from carbohydrates, fat, and protein? (A) 30% carbohydrate, 50% fat, and 20% protein (B) 50% carbohydrate, 35% fat, and 15% protein (C) 20% carbohydrate, 30% fat, and 50% protein (D) 50% carbohydrate, 30% fat, and 20% protein

16. In metabolism，glucose is degraded to CO2 and water. The carbon dioxide is produced in
(A) the red blood cells.
(B) the citric acid cycle.
(C) glycolysis.
(D) the electron transport chain.

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