There is an energy cost for catalytic turnover which arises due to enzyme degradation.
D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D002384:Catalysis; D004734:Energy Metabolism; D004798:Enzymes / Q000378:metabolism*; D006207:Half-Life; D008099:Liver / Q000201:enzymology; D008433:Mathematics; D051381:Rats
D004798:Enzymes; D000255:Adenosine Triphosphate