This flagellate is pear-shaped with "falling leaf" motility.It contains variant-specific surface proteins (VSPs)on its surface,which provide a mechanism for the organism to survive in the small intestine as a result of its ability to resist intestinal proteases.The organism is:
A)G.duodenalis.
B)C.mesnili.
C)D.fragilis.
D)E.hominis.

Question

Quizplus · Accepted Answer

The VSPs are a family of related,highly unusual proteins covering the surface of the organism.The VSPs are resistant to the effects of intestinal proteases,thus allowing the parasites to survive in the protease-rich small intestine.An antigenic variation of the surface antigen during human infections with G.duodenalis has been documented.

This Flagellate Is Pear-Shaped with "Falling Leaf" Motility