The maximal velocity v(max) is obtained when approximately all of the enzyme is in the ES form and when it is dependent upon kcat as this parameter measures the efficiency of the slowest step of the enzyme after ES formation.
Maximal velocity V(max) does depend on the enzyme concentration though all the enzymes are catalysts, because it is just a rate, as mol/sec more enzyme will convert more substrate moles into product.
Here V(max) is equal to the product of the catalyst rate constant (kcat) and the concentration of the enzyme. Kcat is the first-order rate constant which determines the reaction rate when the the enzyme is fully occupied at a saturating concentration of the substrate.
Hence, the answer is given and explained above.
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