Discussion
In enzyme kinetics the rate constant Kcat refers to :
Answer: C
kcat is the Turn over number.
kcat is the first-order rate constant for conversion of the enzyme-substrate complex to product when the enzyme is saturated: \(k_{cat} = V_{max}/[E]_{t}\). It gives the number of substrate molecules one active site converts to product per second. Carbonic anhydrase, for example, has a kcat of about \(10^{6}\) per second.
The Michaelis-Menten constant Km is the substrate concentration at half of Vmax, a different quantity. There is no single substrate concentration 'at Vmax', because Vmax is only approached as the substrate concentration rises. The total number of active sites is [E]t, the term kcat is divided by, not kcat itself.
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