Nokea
The major immunoglobulin family to which a particular immunoglobulin belongs can be determined by sequential analysis of the 110 amino acids beginning from the
Correct Answer: C
Rationale: The correct answer is C: Amino terminus of the heavy chain. This is because the amino acid sequence of immunoglobulins is determined by the heavy chain, making it crucial for identifying the immunoglobulin family. The heavy chain contains the variable (V), diversity (D), joining (J), and constant (C) regions essential for classifying immunoglobulins. Analyzing the amino terminus of the heavy chain allows for the identification of these regions, which are unique to each immunoglobulin class. The other choices are incorrect because the light chain does not contain the necessary regions for determining the immunoglobulin family, making the amino terminus of the heavy chain the key starting point for analysis.