Question

antibody molecules consist of ___ polypeptide chains

Answer 1

A typical antibody molecule iscomposed of four polypeptide chains, two identical heavy chains and two identical light chains. ... There are five classes of antibodies (IgA, IgD, IgE, IgG, and IgM), each with a distinctive heavy chain (α, δ, ε, γ, and μ, respectively).
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Answer 2

antibody molecules consist of 4 polypeptide chains in which two are identical heavy chains and two are identical light chains.