Final answer:
T cells recognize antigens when presented in conjunction with MHC molecules, with helper and regulatory T cells binding to MHC II and cytotoxic T cells to MHC I.
Step-by-step explanation:
T cells recognize antigens only when these are presented by another cell on a major histocompatibility complex (MHC) molecule. Specifically, helper T cells and regulatory T cells interact with antigens presented alongside MHC II molecules, while cytotoxic T cells respond to antigens presented with MHC I molecules. This recognition process is crucial for T cell activation and the initiation of an immune response. Moreover, the interactions of multiple molecules including the T-cell receptor (TCR) and cell adhesion molecules such as CD4 or CD8, which bind to MHC molecules, are essential for the binding and activation of T cells.
T-cells (TCRs) recognize antigens only when presented by another cell on a major histocompatibility complex molecule (MHC). T-cells have antigen receptors called T-cell receptors (TCR) on their surface, which bind to processed antigens presented on MHC molecules. The TCR of a helper T-cell specifically binds to antigens presented with MHC II molecules.