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An antibody molecule is represented as H₂L₂. This means it has:
A2 alpha and 2 beta chains
B2 hydrogen atoms and 2 ligands
C2 helper and 2 lymphocyte chains
D2 heavy (H) chains + 2 light (L) chains held together by disulfide bonds
Answer & Solution
Correct answer: D. 2 heavy (H) chains + 2 light (L) chains held together by disulfide bonds
**Antibody = H₂L₂**: two **heavy (long) chains + two light (short) chains** linked by disulfide bonds. Y-shaped. Antigen-binding sites at the tips. Different classes: **IgA, IgM, IgE, IgG**.
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