The following are steps in the cell-mediated immune response. What is the correct sequence for these steps?
1) Several cycles of mitosis occur.
2) Antigen is engulfed and presented by a macrophage.
3) Cytotoxic T cells migrate to focus of infection.
4) T cells with specific receptors recognize the antigen.
5) T cells differentiate into cytotoxic T cells or T memory cells.
6) Cytotoxic T cells release perforin and/or lymphotoxin.
A) 4, 1, 5, 3, 6, 2
B) 2, 4, 1, 5, 3, 6
C) 1, 2, 4, 5, 3, 6
D) 3, 2, 4, 1, 5, 6
E) 3, 6, 4, 5, 1, 2

Question

Quizplus · Accepted Answer

The correct sequence for the steps in the cell-mediated immune response is as follows:
1) Antigen is engulfed and presented by a macrophage (2).
2) T cells with specific receptors recognize the antigen (4).
3) Several cycles of mitosis occur (1).
4) T cells differentiate into cytotoxic T cells or T memory cells (5).
5) Cytotoxic T cells migrate to focus of infection (3).
6) Cytotoxic T cells release perforin and/or lymphotoxin (6). 
Therefore, the correct sequence is 2,4,1,5,3,6 which is only found in option B.

The Following Are Steps in the Cell-Mediated Immune Response