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Which portion of an antibody provides antigen-binding sites?
  • a)
    Light chain
  • b)
    Constant portion
  • c)
    Heavy chain
  • d)
    Variable portion
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Which portion of an antibody provides antigen-binding sites?a)Light ch...
The variable portion of an antibody, which is part of the heavy chain and the light chain, is responsible for providing antigen-binding sites. The variable regions contain hypervariable regions, also known as complementarity-determining regions (CDRs), which directly interact with antigens. The CDRs exhibit high variability in their amino acid sequences, allowing antibodies to recognize and bind to a wide range of antigens. The constant portion of the antibody, on the other hand, is responsible for other functions such as effector mechanisms and determining the antibody's class or isotype.
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