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
ANSWER: a
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