I think it's 4 because there are 4 peptide chains--( heavy and light), but I don't really know if that's considered as a whole protein?
Can someone walk me through this please.
Can someone walk me through this please.
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Correct. Antibodies have 4 subunits. 2 heavy (220 amino acids long each) and 2 light chains (110 amino acids long each), connected via disulfide bonds.