Bacteria Morphology
The next to last step in peptidoglycan biosynthesis is

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

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Bacteria Morphology
Porins are located in

the peptidoglycan layer of gram-positive bacteria
the cytoplasmic membrane of both gram-negative and gram-positive bacteria
the periplasmic space of gram-negative bacteria
the outer membrane of gram-negative bacteria

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