Bacteria Morphology
The last step in synthesis of peptidoglycan is

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

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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 outer membrane of gram-negative bacteria
the periplasmic space of gram-negative bacteria

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