Antibodies are a type of:

• A. Enzymes
• B. Hormones
• C. Immunoglobulins
• D. Neurotransmitters

Answer: (C)

Antibodies are immunoglobulins—glycoprotein molecules produced by B cells that specifically recognize and bind antigens. This targeted binding allows mechanisms like neutralization, opsonization, and activation of the complement system to help clear pathogens. Immunoglobulins come in several classes (for example IgG, IgM, IgA, IgE, IgD) but all serve the same general role of antigen recognition. They are not enzymes that catalyze chemical reactions, nor hormones that regulate bodily processes, nor neurotransmitters that transmit nerve signals. In lab animal work, immunoglobulins are fundamental to diagnostics and research assays because they provide precise antigen binding.