The enzyme over the energy of activation

1.- What is a energy of activation ? What is the action of the enzyme over the energy of activation? 2.- Please name the 6 types of enzymes. Please explain 3 of them. 3.- Please name the differences between competitive and noncompetitive inhibition 4.- What is a cofactor? Please name 2 of them. 5.- Please name the optimal conditions, for the action of the enzymes. Please explain 2 of them 6.- What means catalyst?