b The helical structure of proteins is stabilized by hydrogen bonds. In helical structure, the carbonyl oxygen atoms in $C = O$ points in one direction, towards the amide hydrogen atoms in $NH$ groups,$4$ residues away. Together these groups form a hydrogen bond, one of the main forces of secondary structure stabilization in proteins. Hydrogen bonds are shown by dashed lines.
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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