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Amino Acids

A decapeptide...

Question

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 ___

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Solution

For n - units of glycine,
$\frac{n \times 75}{(796 + 9 \times 18)} \times 100 = 47$
$\Rightarrow n = 6$

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Q. 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 ___.
(IIT-JEE, 2011)

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