Why is it important that enzymes are not changed after they a reaction?

Surrounded by microtubules, located near the nucleus. (don't try to google it) (give answer only if u know)

How did the discovery of the rhesus factor affect society? o more patients died from having a transfusion with the wrong rhesus factor 0 new treatments during pregnancy could prevent harm to the developing child. o less donated blood could be used in the treatment of patients. the number of blood types was reduced by half

What processes take place before the mature mrna exits the nucleus?