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【简答题】
成年人每天利用ATP情况。 （a）一个68kg的成年人每天（24h）需要此食物中摄取2000kcal（8360kJ）热量。食物代谢产生的能量主要用于身体日常的化学反应和机械功。假设食物能量转化为ATP的效率是50％，计算成年人24h所利用的ATP的重量，它是人体重的百分之多少？ （b）虽然成年人每天合成大量的ATP，但人本身的重量、构造和组成在此期间没有明显改变，试解释看似矛盾的现象。
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