An octapeptide composed of four repeating glycylalanyl units has ___.  A. one free amino group on the glycyl residue and one free carboxyl group on a alanyl residue B. two free carboxyl groups, both on the glycyl residues C. two free amino groups, both on alanyl residue she D. one free amino group on the alanyl residue and one free carboxyl group on a glycyl residue

Biochemistry
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Chapter1: Biochemistry: An Evolving Science
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An octapeptide composed of four repeating glycylalanyl units has ___.  A. one free amino group on the glycyl residue and one free carboxyl group on a alanyl residue B. two free carboxyl groups, both on the glycyl residues C. two free amino groups, both on alanyl residue she D. one free amino group on the alanyl residue and one free carboxyl group on a glycyl residue
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