Concept #1: Approximating the Mass of a Protein

Practice: What is the approximate M r of the enzyme glycogen phosphorylase, which has 842 amino acid residues?

Practice: Myoglobin is an oxygen-storage protein in muscle tissues. If its molecular weight is 16.7 kDa (1 Da = 1 g/mol), about how many amino acid residues does myoglobin have?