Question

Which of the following are proteins that interact directly with antigens during the adaptive immune response?

A. T cell receptors (receptors on T cells)
B. immunoglobins
C. major histocompatibility complex
D. all of these

Answer 1

T cell receptors, immunoglobins (antibodies), and the major histocompatibility complex (MHC) all directly interact with antigens during the adaptive immune response; hence, the correct answer is D. all of these.

Step-by-step explanation:

The proteins that interact directly with antigens during the adaptive immune response are:

• T cell receptors (receptors on T cells)
• Immunoglobins (also known as antibodies)
• Major histocompatibility complex (MHC)

Therefore, the correct answer to the question is D. all of these. Each of these proteins plays a role in recognizing and binding to antigens: T cell receptors bind to antigens presented with MHC molecules on the surface of antigen-presenting cells, immunoglobins can be found on the surface of B cells or secreted into the blood, and the major histocompatibility complex presents processed antigen fragments to T cells. The interaction with these antigen-specific receptors is critical for the activation and regulation of adaptive immune responses.