Question

When an antigen enters the body, it may be recognized by an antibody directly or be taken up by antigen-presenting cells. which of the following membrane bound components are responsible for the adaptive immune response?

(select all that apply)
A. major histocompatibility complex (mhc) class i
B. major histocompatibility complex (mhc) class ii
C. antibodies
D. helper t cell receptor (tcr)
E. cytotoxic t cell receptors (tcr)
F. cytokines

Answer 1

The components responsible for adaptive immune response upon antigen entry are MHC Class I, MHC Class II, and T cell receptors (both Helper and Cytotoxic). MHC Class I presents antigens to effector T cells, while MHC Class II is used by professional antigen-presenting cells. TCRs recognize antigens bound to MHC on these cells.

Step-by-step explanation:

When an antigen enters the body and is recognized or taken up by antigen-presenting cells, the following membrane-bound components are responsible for facilitating the adaptive immune response:

• Major histocompatibility complex (MHC) Class I
• Major histocompatibility complex (MHC) Class II
• Helper T cell receptor (TCR)
• Cytotoxic T cell receptors (TCR)

MHC Class I molecules are found on all nucleated cells and present antigens to effector T cells. MHC Class II molecules are found only on professional antigen-presenting cells like macrophages, dendritic cells, and B cells, presenting antigens for initial activation of T cells. Helper and Cytotoxic TCR recognize processed antigens presented on MHC molecules and are vital in T cell-mediated immunity.