Question

An immune cell is observed to present antigen to helper T-lymphocytees and cytotoxic T-lymphocytes. Using this information, select all that apply.

A. The cell is an antigen-presenting cell.
B. The cell may be a macrophage .
C. The cell may be a dendritic cell.
D. The cell may be a B-lymphocyte.

Answer 1

Based on the information given, we know that the cell is presenting antigen to both helper T-lymphocytes and cytotoxic T-lymphocytes, which suggests that it is an antigen-presenting cell (APC). APCs are cells that present antigen to T cells in order to initiate an immune response. Macrophages and dendritic cells are both types of APCs, so either of these cell types could be responsible for presenting the antigen in this scenario. B-lymphocytes are not typically considered to be APCs, so it is less likely that the cell is a B-lymphocyte. (LETTER D)