An example of an antigen that could stimulate naïve B-cell proliferation and differentiation without the help of a T cell would be:
a. Proteus vulgaris, lipopolysaccharide molecule
b. Yersinia pestis, plasmid DNA molecule
c. Staphylococcus aureus, protein A molecule
d. Bacillus anthracis, anthrax toxin molecule
e. Escherichia coli, porin protein molecule
Answer: Proteus vulgaris, lipopolysaccharide molecule
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