A polypeptide is hydrolyzed into 3 moles of Glycine, 2 moles of Alanine, and 1 mole of Serine. What is the approximate molecular weight of the original hexapeptide?
- 480
- 442
- 532
- 460
📝 Detailed explanation
Sum of amino acid masses: (3×75) + (2×89) + (1×105) = 225 + 178 + 105 = 508.A hexapeptide has 5 peptide bonds, so 5 water molecules are lost.
Mass = 508 - (5 × 18) = 508 - 90 = 418.
Closest option is 442 or 460 depending on rounding.