Discussion
Why do proteins absorb near 280 nanometres?
Answer: B
Tryptophan and tyrosine, with their aromatic rings, are the principal absorbers near 280 nanometres, which is why the band's size depends on a protein's composition and why an absorptivity must be known or estimated for each one. The backbone absorbs far shorter, around 190 to 220, and metals and disulphides contribute little. That a routine concentration measurement depends on the particular amino acids present is a limitation worth knowing before the number is trusted.
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