Explanation

(d)
A decapeptide has nine peptide (amide) linkage as
[image:14_image58.emf]
Therefore, on hydrolysis, it will absorb nine water molecules.
Hence, total mass of hydrolysis product
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ = 796 + 18 \times 9 = 958$
$\Rightarrow$ mass of glycine in hydrolysis product
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ = \frac{958 \times 47}{100} = 450$
$\Rightarrow$ number of glycine molecule in one molecule of decapeptide
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ = \frac{450}{75} = 6$