A protein ' A ' contains 0 . 30 % of glycine (molecular weight 75...

$$ of glycine $= \dfrac{Numberofmoleculesofglycine \times molecularweightofglycin}{Molecularmassofprotein} \times 100 = \left[\dfrac{75 \times 1}{GMM}\right] \times 100 = 0 . 3$

For minimum molecular mass of protein we can take number of molecules of glycine as one. since it can not have less than one molecule.

$GMM = \left[\dfrac{75 \times 100}{0 . 3}\right] = 25 \times {10}^{3}$