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Answer: the law of c<span>onservation of energy.
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This law applies to <span>isolated system and means that the total energy in a given frame of reference is conserved over time. Its</span><span> not created or destroyed and can only be converted from one form to another.
</span>The <span>conservation of energy can be proven by the Noether theorem.</span>
Enzymes are protein in nature, (Mostly some RNA and DNA also can act as enzymes) but for generic purposes Enzymes are proteins.
