Questions: The Gram-negative cell wall is characterized by a(n) that contains a molecule called outer membrane; lipopolysaccharide outer membrane; mycolic acid inner membrane; lipopolysaccharide inner membrane; mycolic acid

The answer is the first one: outer membrane; lipopolysaccharide.

Explanation for each option:

• Outer membrane; lipopolysaccharide: This is the correct answer. Gram-negative bacteria have a cell wall characterized by an outer membrane that contains lipopolysaccharides (LPS). The LPS is a crucial component of the outer membrane, contributing to the structural integrity of the bacteria and protecting it from certain kinds of chemical attacks.

• Outer membrane; mycolic acid: This is incorrect. Mycolic acid is not found in the outer membrane of Gram-negative bacteria. Instead, mycolic acids are associated with the cell walls of mycobacteria, which are a different group of bacteria.

• Inner membrane; lipopolysaccharide: This is incorrect. The inner membrane of Gram-negative bacteria does not contain lipopolysaccharides. LPS is specifically located in the outer membrane.

• Inner membrane; mycolic acid: This is incorrect. As mentioned earlier, mycolic acid is not a component of Gram-negative bacteria. It is found in the cell walls of mycobacteria.

In summary, the Gram-negative cell wall is characterized by an outer membrane that contains lipopolysaccharide.