Final answer:
Cluster of Differentiation receptors are known as "CD receptors," specifically answer B) CD. These receptors include B-cell receptors (BCRs) and T-cell receptors (TCRs), which are essential for immune system recognition of antigens and triggering specific immune responses.
Step-by-step explanation:
Cluster of Differentiation receptors are known by the abbreviated "CD receptors." Therefore, the correct answer to the question is B) CD.
CD receptors can be found on the surface of various immune cells and have a major role in immune response. For instance, B-cell receptors (BCRs) are specific types of CD receptors found on B cells. The BCRs are involved in the specific recognition of antigens, and they bind to antigens via their Fab antigen-binding regions. All of the receptors on a single B cell will bind the same specific antigen, though different B cells will have BCRs specific for different antigens.
Another example is T-cell receptors (TCRs), which also belong to the same receptor family. However, TCRs are smaller and less complex than BCRs. Both BCRs and TCRs can recognize distinct antigen epitopes, which is crucial for immune function. The ability of diverse receptors to bind the same ligand but induce different responses in each cell type exemplifies the versatility and specificity of the immune system.