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AP Bio

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Antibodies are
A. proteins or polysaccharides usually found on the cell surface of invading bacteria or viruses
B. proteins that consist of two light and two heavy polypeptide chains
C. proteins circulating in the blood that tag foreign blood cells for complement-mediated lysis
D. proteins embedded in B-cell membranes
E. b,c,and d are correct
---I have chosen E...second opinions?

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    I really appreciate any opinions!

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