Proteins differ from one another because?

A. The peptide bonds linking amino acids differ from protein to
protein
B. The sequence of amino acids in the polypeptide chain differs
from protein to protein
C. Each protein molecule contains its own unique sequence
of molecules
D. The number of nucleotides in each protein varies from mole
molecule
E. The number of nitrogen atoms in each amino acid differs from
number in all others

Answer:
It's B...the differ by the type, number, and sequence of AMINO ACIDS... I am quite sure.
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