A decapeptide (Mol. Wt. 796) on complete hydr | vedclass

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(C) Molecular weight of decapeptide $= 796 \ g/mol$.$A$ decapeptide contains $10$ amino acid units,so it has $(10-1) = 9$ peptide bonds.Upon complete

Vedclass · Accepted Answer

$6$

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(C) Molecular weight of decapeptide $= 796 \ g/mol$.$A$ decapeptide contains $10$ amino acid units,so it has $(10-1) = 9$ peptide bonds.Upon complete hydrolysis,$9$ molecules of water are added.Total weight of water added $= 9 	imes 18 \ g/mol = 162 \ g/mol$.Total weight of hydrolysis products $= 796 + 162 = 958 \ g$.Total weight of glycine in the product $= \frac{47.0}{100} 	imes 958 \ g = 450.26 \ g \approx 450 \ g$.Molecular weight of glycine $= 75 \ g/mol$.Number of glycine units $= \frac{450 \ g}{75 \ g/mol} = 6$.

	$\text{Molisch's Test}$	$\text{Barfoed Test}$	$\text{Biuret Test}$
$A$	$\text{Positive}$	$\text{Negative}$	$\text{Negative}$
$B$	$\text{Positive}$	$\text{Positive}$	$\text{Negative}$
$C$	$\text{Negative}$	$\text{Negative}$	$\text{Positive}$

$A$ 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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