Final answer:
Bacterial cell walls are made of peptidoglycan, not cellulose, unlike the cell walls of plants and some algae. Therefore, the correct option is A.
Step-by-step explanation:
The cell wall of bacteria is not made up of cellulose. Instead, the chief component of bacterial cell walls is peptidoglycan, which is a complex polymer of sugars and amino acids. In contrast, the cell walls of plants and some algae, such as Hydrilla, Mango trees, and Cacti, are primarily composed of cellulose, a polysaccharide made up of glucose units. Therefore, the correct option is A.