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Cell Wall Structure and Functions

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Questions and Answers

What is a main component of the Gram-negative cell wall outer membrane?

Lipopolysaccharides (correct)
Fibers
Teichoic acid
Peptidoglycan

What is the function of porins in the Gram-negative cell wall outer membrane?

To prevent the passage of nutrients
To form channels for molecule passage (correct)
To enhance the action of complement
To provide a barrier to antibiotics

What is the effect of the strong negative charge of the Gram-negative cell wall outer membrane on phagocytosis?

It has no effect on phagocytosis
It enhances phagocytosis
It prevents phagocytosis (correct)
It promotes the action of complement

What is the primary function of the Gram-negative cell wall outer membrane?

To regulate the passage of molecules (C) Signup and view all the answers

What is the purpose of the outer membrane in the Gram-negative cell wall?

To provide a barrier to certain antibiotics and digestive enzymes (C) Signup and view all the answers

What is the result of the reaction between crystal violet and iodine in the Gram stain mechanism?

The formation of large crystals that cannot escape the cell wall (B) Signup and view all the answers

What is the difference between the Gram-positive and Gram-negative cell walls in terms of the Gram stain mechanism?

The structure of the cell wall (A) Signup and view all the answers

What is the purpose of the Gram stain mechanism?

To differentiate between Gram-positive and Gram-negative bacteria (B) Signup and view all the answers

What is the function of the periplasmic space in the Gram-negative cell wall?

To facilitate the passage of molecules (D) Signup and view all the answers

What is the effect of the outer membrane on the action of lysozyme?

It prevents the action of lysozyme (B) Signup and view all the answers

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