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What will be the molecular mass of a protein that is composed of 100 amino acids, if the average mw of 20 amino acids is 136?

By Hitesh K

Question: What will be the molecular mass of a protein that is composed of 100 amino acids, if the average mw of 20 amino acids is 136?

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2 comments

  1. In the formation of a peptide bond, a water molecule is “lost” (18Da),
    so if there are 100 amino acids (of average weight = 136), 99 peptide bonds were created, kicking out 99 x 18 = 162 Da.

    100 AA x 136 Da = 13,600 Dalton

    Removing the “water” upon condensation gives
    13,600 Da – 162 Da = 13,438 Da = 13,438 g/mol

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