JEE Advanced · Chemistry · 29. Biomolecules
A decapeptide (molecular weight 796) on complete hydrolysis gives glycine (molecular weight 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
- A 6
- B 12
- C 18
- D 22
Answer & Solution
Correct Answer
(A) 6
Step-by-step Solution
Detailed explanation
A decapeptide has nine peptide (amide) linkage as
Therefore, no 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 \(=\frac{450}{75}=6\)
Therefore, no 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 \(=\frac{450}{75}=6\)
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