Question

Identify which statements are correct.
A. All bacteria have peptidoglycan in their cell walls.
B. All fungi have chitin in their cell walls.
C. All algae have cellulose in their cell walls
D. All protozoans have protein in their cell walls.

Answer 1

Statements A, B and C are correct.

Explanation:

• Statement D is incorrect.
• Protozoa are unicellular eukaryotic microorganisms. However, the amount of diversity in terms of morphology, size and life styles exhibit by protozoa makes it difficult to develop a more precise definition.
• Protozoa are composed primarily of chitin. The rigidity and strength provided by cell walls protects cells against mechanical stress and confers osmotic stability.
• Thus, coincident with the loss of the murein cell wall in the early eukaryote was the development of endocytoskeletal systems based on actin and tubulin to compensate for the relative fragility of a naked plasma membrane.