Bacteria Morphology
The last step in synthesis of peptidoglycan is

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

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Bacteria Morphology
Periplasm is

the interior portion of mitochondria
the area between the inner and outer membranes of Gram-positive bacteria
the area outside the cell membrane that is influenced by the polymers
the area between the inner and outer membranes of gram-negative bacteria

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