Question

What are the properties of B cell receptor (BCR)?

1) It is a membrane-bound antibody molecule
2) It is involved in the recognition and binding of antigens
3) It plays a role in the activation of B cells
4) All of the above

Answer 1

B cell receptors (BCRs) are membrane-bound antibody molecules that are involved in the recognition and binding of antigens and play a role in the activation of B cells.

Step-by-step explanation:

The properties of B cell receptor (BCR) include:

1. It is a membrane-bound antibody molecule: BCRs are membrane-bound monomeric forms of IgD and IgM that are embedded in the membranes of B cells.
2. It is involved in the recognition and binding of antigens: BCRs bind specific antigen epitopes with their Fab antigen-binding regions, allowing B cells to recognize and bind antigens.
3. It plays a role in the activation of B cells: BCRs are involved in the activation of B cells when they encounter antigens. Upon binding an antigen, B cells internalize the antigen and present it on MHC II, which is recognized by helper T cells that activate the B cell.

Therefore, the correct answer is 4) All of the above.