JEE Advanced · 2011 · 10 Apr 2011 · Paper 1 · Biomolecules

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A decapeptide (Mol. Wt. 796) on complete hydrolysis gives glycine (Mol. Wt. 75), alanine and phenylalanine. Glycine contributes 47.0 % to the total weight of the hydrolysed products. The number of glycine units present in the decapeptide is

Answer: 6

Solution

When a decapeptide (10 amino acids) is hydrolyzed, 9 water molecules are added.

Total weight of hydrolyzed products = 796 + 9 × 18 = 796 + 162 = 958 g/mol

Weight of glycine in products = 47% of 958 = 0.47 × 958 = 450.26 g

Number of glycine units =

\frac{450.26}{75} \approx 6

Therefore, the number of glycine units = 6

JEE Advanced · 2011 · 10 Apr 2011 · Paper 1 · Integer answer

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