Final answer:
No, MHC molecules do not allow a T-cell to recognize any presented antigen. They present antigens to T-cells based on the type of MHC molecule. MHC I presents antigens to cytotoxic T-cells, while MHC II presents antigens to helper T-cells.
Step-by-step explanation:
No, MHC (Major Histocompatibility Complex) molecules do not allow a T-cell to recognize any presented antigen. MHC molecules are responsible for presenting antigens to T-cells, but the type of MHC molecule determines which T-cell can recognize the antigen. There are two classes of MHC molecules, MHC I and MHC II. MHC I molecules are found on all nucleated cells and present antigens to cytotoxic T-cells, while MHC II molecules are only found on macrophages, dendritic cells, and B-cells and present antigens to helper T-cells. Therefore, a T-cell can only recognize antigens presented with the appropriate MHC molecule, not any presented antigen.