Under normal circumstances, the proportions of protein, carbohydrates, and lipids in the fresh weight of cells are: 7% to 10%, 1% to 1.5%, and 1% to 2%; each gram of protein, glycogen, and fat are released from oxidative decomposition. The energy is 17kJ, 17kJ, and 39kJ in turn. From this, it may be concluded that the three in terms of energy metabolism are________
A. Fat is the main source of energy
B. Carbohydrates are the main source of energy
C. Protein is the main source of energy
D. All three can be oxidized and decomposed to release energy, and they are all energy substances.
Answer:D
Under normal circumstances, the proportions of protein, carbohydrates, and lipids in the fresh weight of cells are: 7% to 10%, 1% to 1.5%, and 1% to 2%; each gram of protein, glycogen, and fat are released from oxidative decomposition. The energy is 17kJ, 17kJ, and 39kJ in turn. From this, it may be concluded that the three in terms of energy metabolism are________
A. Fat is the main source of energy B. Carbohydrates are the main source of energy C. Protein is the main source of energy D. All three can be oxidized and decomposed to release energy, and they are all energy substances.