Question

plant cells and bacterial cells both have cell walls, but the composition of their cell walls is different. which statement best explains this difference?
○a plant cell walls are made of cellulose, while bacterial cell walls are made of peptidoglycan.
○b both plant and bacterial cell walls are made of the same material, but plant walls are thicker.
○c plant cell walls are made of proteins, while bacterial cell walls are made of lipids.
○d both plant and bacterial cell walls contain chlorophyll to help with photosynthesis.

Explanation:

To solve this, we analyze each option:

• Option A: Plant cell walls are made of cellulose, and bacterial cell walls are made of peptidoglycan. This is a correct biological fact about the composition of their cell walls.
• Option B: Plant and bacterial cell walls are made of different materials (cellulose vs. peptidoglycan), so this is incorrect.
• Option C: Plant cell walls are made of cellulose (a carbohydrate), not proteins, and bacterial cell walls are made of peptidoglycan, not lipids. So this is incorrect.
• Option D: Bacterial cell walls do not contain chlorophyll (and most bacteria don't perform photosynthesis), and not all plant cells with cell walls (like root cells) have chlorophyll for photosynthesis. So this is incorrect.

Answer:

A. Plant cell walls are made of cellulose, while bacterial cell walls are made of peptidoglycan.