Answer:
In this case, sodium functions as a cofactor for enzymes involved in the hydrolysis of ATP.
Step-by-step explanation:
Cofactors are ions or non-protein molecules required for the correct operation of enzymes. They can attach to enzymes and stabilize the substrate's transition state, which aids in catalyzing processes. While some enzymes need organic cofactors like flavin or heme, others need metallic ions like magnesium or zinc.
Some enzymes that catalyze the hydrolysis of ATP utilize sodium ions (Na+) as a cofactor in their function. For these enzymes to correctly bind to and catalyze the hydrolysis of ATP, Na+ ions must be present. The enzymes wouldn't be able to work correctly and ATP wouldn't be hydrolyzed if these ions weren't there.