[Campbell Biology P.623] Which of the following statements about Gram-positive and Gram-nega... | Practice Question

Which of the following statements about Gram-positive and Gram-negative bacteria is INCORRECT?

  • A: Gram-positive bacteria have a relatively simple wall composed of a thick layer of peptidoglycan.
  • B: Gram-negative bacteria possess an outer membrane containing lipopolysaccharides.
  • C: The lipopolysaccharides in the outer membrane of Gram-negative bacteria are non-toxic and do not cause fever or shock.
  • D: Gram-negative bacteria tend to be more resistant to antibiotics because their outer membrane impedes drug entry.

Explanation

The lipid portions of the lipopolysaccharides in the walls of many Gram-negative bacteria are toxic, causing fever or shock. This contradicts option C, making it the incorrect statement. The other options accurately describe characteristics of Gram-positive and Gram-negative bacteria.