Question $4.$ A scientist is trying to develop an inhibitor against an important bacterial protein that can be used as a new antibacterial compound. They characterize the kinetic properties of the enzyme with $($dashed line$)$ and without $($solid line$)$ drug. Answer the questions below. Note that $"uM"$ in the plot means $M($micromolar$,{10}^{-6}M).$

$(1)$ Calculate the $($apparent$)V_{\text{m}\text{a}\text{x}}$ and $K_M$ for both the no drug and drug condition.

$(2)$ What is the mechanism corresponding to the drug?

$(3)$ The experiment is carried out at $15M$ drug. Calculate the value of $K_{\text{I}}.$