Final answer:
All nucleated cells have some MHC-I only macrophages, dendritic cells, and B cells have MHC class II molecules
Step-by-step explanation:
The question refers to the two classes of major histocompatibility complex (MHC) molecules involved in the adaptive immune response: MHC I and MHC II. MHC class I molecules are found on all nucleated cells. They display normal self-antigens, as well as antigens from abnormal or non-self pathogens to effector T cells, which are key in cellular immunity.
On the other hand, MHC class II molecules are restricted to specific cells of the immune system known as professional antigen-presenting cells, which include macrophages, dendritic cells and B cells. MHC class II molecules are crucial for presenting abnormal or non-self pathogen antigens that are necessary for the activation of T cells.