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Antibodies and acquired immunity


Joseph, an intern at a lab, studies the chemical composition and structure of an antibody. He tabulates his observations, as seen below.
Type of moleculeNucleic acid
StructureFour heavy chains
Nature of intramolecular bondDisulphide bond
Joseph's supervisor goes through his notes and points out several incorrect entries.
Which detail did Joseph correctly report?
Choose 1 answer: