A certain amino acid is present to the extent of 0.22% in a protein. Assuming that the molar mass of amino acid is 89, what is the approximate lowest possible molar mass of protein (in g mol–1)?
(1) 4.05 × 104 (2) 5.4 × 104
(3) 5.04 × 103 (4) 4.5 × 103
