Lets say you were comparing two enzymes that both carried out the reaction shown below, breaking down the antibiotic penicillin into a useless product. Shown below are curves that show how the reaction velocity varies with penicillin concentration. Which enzyme likely binds better to penicillin?

Let's say you were comparing two enzymes that both carried out the reaction shown below, breaking down lactose into galactose and glucose. Shown below are curves that show how the reaction velocity varies with lactose concentration. Which enzyme active site likely matches up with the structure of lactose better