The Number of Tryptophan Residues in Bovine Serum Albumin A quantitative aminoa acid analysis reveals that bovine serum albumin (BSA) contains 0.58% tryptophan (Mr 204) by weight. (a) Calculate the minimum molecular weight of BSA (i.e., assuming there is only one tryptophan residue per protein molecule). (b) Gel filtration of BSA gives a molecular weight estimate of 70,000 Da. How many tryptophan residues are present in a molecule of serum albumin? 6

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