a. duoi day la vi tri gioi han cua cac enzyme cat gioi han tren doan gen dich giua vi tri giuoi han cua enzyme Pvull) Ban dau nguoi ta cat gen bang enzyme Pvull sau do bo sung vao mot so loai enzyme. hay cho biet kich thuoc cac bang enzyme EcoRI, ENzyme EcoRI va BamHI Pvull va Sall
b.