Wolbachia does not have a cell wall. Wolbachia is a genus of bacteria that primarily infects insects and some other arthropods, and bacteria do not possess a cell wall like plants or fungi do.
In contrast:
- Duckweed (a plant) has a cell wall made of cellulose.
- Lobster (a crustacean) has an exoskeleton but does not have a typical cell wall.
- Yeast (a type of fungus) also has a cell wall, primarily composed of chitin.
So in this context, the best answer is Wolbachia, as it is the only one listed that is a bacteria and does not have a standard cell wall structure.