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What is Antibody in Biology? PDF | Download eBooks

Learn Antibody definition in biology with explanation to study “What is Antibody”. Study antibody explanation with biology terms to review biology course for online degree programs.

Antibody Definition

  • Secreted proteins from the B cells are called antibodies.

    Campbell Biology by J.B. Reece, L.A. Urry, M.L. Cain, S.A. Wasserman, P.V. Minorsky, R.B. Jackson



Antibody Explanation

Antibodies are secreted proteins from the B cells. The antibodies have the same Y-shaped structure as B cell antigen receptors but are secreted rather than membrane bound. It is antibodies and not the B cells themselves, that actually help defend against pathogens. The antigen-binding site of a membrane-bound receptor or antibody has a unique shape that provides a lock-and-key fit for a particular epitope. Noncovalent bonds between an epitope and the surface of the binding site provide a precise interaction. Differences in the amino acid sequences of variable regions provide the variation in binding surfaces that enables this highly specific binding.

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