Protein Sequences Are Customarily 'Reconstructed' from Sequenced Fragments Because

Multiple Choice

Protein sequences are customarily 'reconstructed' from sequenced fragments because

A) protein purification invariably results in the fragmentation of the protein of interest.
B) proteins are naturally and inevitably cleaved by proteolytic enzymes.
C) proteins are composed of multiple subunits.
D) large polypeptides cannot be directly sequenced.
E) all of the above