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Which of the following is true about the structure of the gram-negative cell wall

  • A.thick peptidoglycan layer
  • B.periplasmic space is absent 
  • C.include outer membrane
  • D.All of the above 

Answer: C

Correct answer: include outer membrane

The defining feature of the gram-negative wall is the outer membrane, whose outer leaflet is lipopolysaccharide. The other two statements are false: its peptidoglycan layer is thin, and it does have a periplasmic space - the compartment between the two membranes.

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