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167337 Microbiology

Which one of the following statements best describes immunoglobulin structure?

AThe amino acid sequence variation of the heavy chains is different than that observed in light chains
BIn humans, there are approximately twice as many Ig molecules with k and l chains (Correct Answer)
CIn the three-dimensional structure of Ig, there is little, if any, flexibility in the hinge region between the Fc and two Fab poions
DIgM is a monomeric structure