Explanation:

1. Bacteria: Most bacteria have a cell wall made of peptidoglycan, which provides structure and protection.
2. Diatom: Diatoms are a type of algae and have a unique cell wall made of silica.
3. Mushroom: Mushrooms are fungi, and their cell walls are made of chitin, the same material found in the exoskeletons of arthropods like insects and crustaceans.
4. Tapeworm: Tapeworms are parasitic flatworms that belong to the animal kingdom, and like most animals, they do not have a cell wall. They have a more flexible cell membrane instead.