5. The functions of gram-negative bacterial cell wall are which of the following: It I-is an antigen 2-gives bacteria shape 3-is an endotoxin 4-takes part in materials movement

The correct answer is 1, 3, and 4.1. The gram-negative bacterial cell wall contains lipopolysaccharides (LPS), which act as endotoxins. These endotoxins can trigger strong immune responses in animals.3. The gram-negative bacterial cell wall is composed of a thin layer of peptidoglycan and an outer membrane containing lipopolysaccharides. This structure contributes to the shape of the bacteria.4. The gram-negative bacterial cell wall plays a role in the movement of materials in and out of the cell. The outer membrane allows for the passage of certain molecules while restricting others, thus regulating the movement of substances.