Cell Wall Composition in Eukaryotes and Prokaryotes

Steps:

• Recall that cell walls provide structural support and vary by organism type.
• Identify the material: cellulose is a polysaccharide unique to plant cell walls.
• Compare options: eliminate those without cellulose.
• Confirm plant cells use cellulose for rigidity and protection.

Why D is correct:

• Plant cells have primary cell walls made of cellulose microfibrils, as defined in plant biology for maintaining turgor pressure.

Why the others are wrong:

• A. Animal cells lack cell walls entirely, relying on extracellular matrix.
• B. Bacterial cells have peptidoglycan cell walls, not cellulose.
• C. Fungal cells have chitin-based cell walls, a different polysaccharide.

Final answer: D