Questions: Question 15 Which of the following is NOT found in the Gram-Negative cell wall structure? (A) Peptidoglycan (B) Lipopolysaccharides (C) Porins (D) Periplasmic Space (E) Teichoic Acids Question 16

The answer is (E): Teichoic Acids.

Explanation for each option:

(A) Peptidoglycan - This is found in the Gram-negative cell wall, although it is much thinner than in Gram-positive bacteria.

(B) Lipopolysaccharides - These are a major component of the outer membrane of Gram-negative bacteria.

(C) Porins - These proteins are found in the outer membrane of Gram-negative bacteria and allow the passage of certain molecules.

(D) Periplasmic Space - This is the space between the outer membrane and the plasma membrane in Gram-negative bacteria.

(E) Teichoic Acids - These are found in the cell walls of Gram-positive bacteria, not in Gram-negative bacteria.

Summary: Teichoic acids are not found in the Gram-negative cell wall structure.