Which of the following is a class of immunoglobulins?

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Multiple Choice

Which of the following is a class of immunoglobulins?

Explanation:
Immunoglobulins are categorized by the constant region of their heavy chain, which defines the class isotypes: IgM, IgD, IgG, IgA, and IgE. IgG is a class of immunoglobulins; it is the most abundant antibody in serum, can cross the placenta, and handles many defense tasks: neutralizing toxins and pathogens, tagging microbes for phagocytosis (opsonization), and activating the classical complement pathway. These capabilities, especially its high affinity after maturation and its role in secondary responses, make IgG a distinct and essential immunoglobulin class. The other options are not classes: IgH denotes a heavy-chain component, not a complete antibody class; IgL refers to light chains that pair with heavy chains; IgX is not a recognized immunoglobulin class.

Immunoglobulins are categorized by the constant region of their heavy chain, which defines the class isotypes: IgM, IgD, IgG, IgA, and IgE. IgG is a class of immunoglobulins; it is the most abundant antibody in serum, can cross the placenta, and handles many defense tasks: neutralizing toxins and pathogens, tagging microbes for phagocytosis (opsonization), and activating the classical complement pathway. These capabilities, especially its high affinity after maturation and its role in secondary responses, make IgG a distinct and essential immunoglobulin class. The other options are not classes: IgH denotes a heavy-chain component, not a complete antibody class; IgL refers to light chains that pair with heavy chains; IgX is not a recognized immunoglobulin class.

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