IgM have how many four-peptide subunits: March 2010
Correct Answer: 5
Description: IgM molecules are polymers of five four-peptide subunits. In the pentameric form all heavy chains are identical and all light chains are identical. It has another protein covalently bound a S-S bond called the J chain. This chain functions in polymerization of the molecule into a pentamer
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Microbiology
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