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The average molecular weight of an amino acid residue in a protein is about _________

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The average molecular weight of an amino acid residue in a protein is about _________

(a) 128

(b) 118

(c) 110

(d) 120

I got this question in unit test.

My doubt stems from Peptides and Proteins in section Amino Acids, Peptides and Proteins of Biochemistry

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The correct answer is (c) 110

For explanation I would say: The average molecular weight of an amino acid residue is nearer to 128. Because a molecule of water is removed to create each peptide bond, average molecular weight is 128 – 18 = 110.

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