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

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

6.0

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

6.00

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

Molecular weight of decapeptide = 796 g/mol
Total bonds to be hydrolysed ( 10-1 ) = 9 per molecule
Total weight of $H_{2} O$ added = 9 x 18= 162 g/mol
Total weight of hydrolysis products = 796 + 162 = 958 g
Total weight % ofglycine (given) = 47%

Total weight of glycine in product = $\frac{958 \times 47}{100}$ = 450 g
Molecular wetght of glycine = 75 g/mol
Number of glycine molecules = $\frac{450}{75} = 6$

Suggest Corrections

Similar questions

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 ___

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)

Q. A decapeptide (MW = 796) on complete hydrolysis gives glycine (MW = 75), alanine and phenylalanine. Glycine contributes 47.0 % of the total weight of the hydrolyzed products. The number of glycine units present in the decapeptide is:

Q. A peptide is a short chain of amino acids. The amino acids in a peptide are connected to one another in a sequence by bonds called peptide bonds. Typically, peptides are distinguished from proteins by their shorter length, although the cut-off number of amino acids for defining a peptide and protein can be arbitrary.
Peptides are generally considered to be short chains of two or more amino acids. Meanwhile, proteins are long molecules made up of multiple peptide subunits, and are also known as polypeptides. Proteins can be digested by enzymes (other proteins) into short peptide fragments. Among cells, peptides can perform biological functions. For example, some peptides act as hormones, which are molecules that when released from cells affect other areas of the body.
A decapeptide (Mol. Wt. 796 g/mol) on complete hydrolysis gives glycine (Mol. Wt. 75 g/mol), alanine and phenylalanine. Glycine contribute 47% to the total weight of the hydrolyzed product.The number of glycine units in the decapeptide is:

Q. Molecular mass of the glycine is 75 g/mol, methionine is 149 g/mol, alanine is 89 g/mol, valine is 117 g/mol and phenylalanine is 165 g/mol.

Then what would be the molecular mass of protein with sequence
Gly – Ala – Phe – Val – Met – Gly

Join BYJU'S Learning Program