Bacteria Morphology
The last step in synthesis of peptidoglycan is

attaching two amino acids to form a cross-link
attachment of a peptide to muramic acid
binding of penicillin to a membrane protein
attachment of a portion of peptidoglycan to a membrane lipid

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Bacteria Morphology
The next to last step in peptidoglycan biosynthesis is

removal of the subunit from bactoprenol
cross-linking the peptide side chains of peptidoglycan
linking the sugar of the disaccharide-peptide unit to the growing peptidoglycan chain
synthesis of the NAM-peptide subunit

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