# QUESTION 21 These proteins, often injected into host cells by a type 3 secretion system, allow...

###### Question:

QUESTION 21 These proteins, often injected into host cells by a type 3 secretion system, allow certain bacteria to penetrate cells by inducing phagocytosis of the bacteria by the host cell. As a result, these bacteria don't have to compete for nutrients and can resist many body defense molecules. This is used as a virulence factor by Shigella, Yersinia, and Salmonella. This best describes what? Bacterial flagella and axial filaments. Bacterial cell surface proteins called adhesins. Bacterial capsules (glycocalyces). Bacterial invasions Bacterial pili.

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