Many cells of the immune system have receptors that detect peptidoglycans and lipopolysaccharides. How do pathogenic bacteria avoid detection?
A. Pathogenic bacteria lack cell walls.
B. Disease is only possible if the immune system has been compromised by some other event.
C. Peptidoglycans are absent from pathogenic bacteria.
D. Pathogens often encase themselves in a gelatinous capsule.
Answer: D
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