1. A critical transition state in serine protease catalysis is the “tetrahdedral intermediate” Briefly describe the role

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1.
A critical transition state in serine protease catalysis is the“tetrahdedral intermediate”
Briefly describe the role played by each member of the catalytictriad in the process of forming the first tetrahedralintermediate.
2. Explain why a type AB individual can receive atransfusion of type A or type B blood, but a type A or type Bindividual cannot receive a transfusion of type AB blood.