Microbiology Which one of the following statements best describes immunoglobulin structure? A The amino acid sequence variation of the heavy chains is different than that observed in light chains B In humans, there are approximately twice as many Ig molecules with k and l chains C In the three-dimensional structure of Ig, there is little, if any, flexibility in the hinge region between the Fc and two Fab poions D IgM is a monomeric structure 💡 Explanation Which one of the following statements best describes immunoglobulin structure? ✓ Correct Answer: B. In humans, there are approximately twice as many Ig molecules with k and l chains