Place the steps of bacterial antigen processing and presentation in the correct order.
1) Lysosomal enzymes digest the bacterium into molecular bits.
2) The antigen-MHC complex is displayed on the cell surface.
3) The endocytic vesicle fuses with a lysosome.
4) A bacterium is engulfed by a phagocytic cell.
A) 4-3-1-2
B) 4-3-2-1
C) 3-4-2-1
D) 3-4-2-1.
E) 2-4-3-1

Question

Quizplus · Accepted Answer

The correct sequence for bacterial antigen processing and presentation starts with a bacterium being engulfed by a phagocytic cell (4), followed by the fusion of the endocytic vesicle with a lysosome (3). Lysosomal enzymes then digest the bacterium into molecular bits (1), and finally, the antigen-MHC complex is displayed on the cell surface (2).

Place the Steps of Bacterial Antigen Processing and Presentation in the Correct