In light chain of antibodies:
Correct answer: B. The variable sequence of amino acids is shorter.
- A. The variable sequence of amino acids is longer.
- B. The variable sequence of amino acids is shorter.
- C. Both variable and constant amino acid sequences have equal length.
- D. Only the variable sequence of amino acids occurs.
Explanation
The light chain of an antibody consists of both variable and constant regions. The variable region is shorter in terms of sequence length but is highly diverse to enable the recognition of a wide variety of antigens, which is crucial for the adaptive immune response. The constant region provides structural stability. Option B is correct because it correctly identifies the typical structure of the light chain, while the other options either misinterpret the structural differences or incorrectly describe the presence or absence of these regions.
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Specific defense mechanisms protect the body through antigen recognition by B and T lymphocytes. The topic covers clonal selection, antibody production, plasma and memory cells, cell-mediated responses, helper and cytotoxic T cells, and the difference between primary and secondary immune responses.
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