Which group of organisms would not typically have a cell wall?

Protozoa are indeed a group of organisms that typically do not have a cell wall. Instead, they possess a flexible cell membrane that allows for a variety of movements and shapes. This characteristic enables protozoa to interact more dynamically with their environment, aiding in processes like feeding and locomotion.

In contrast, bacteria have cell walls that provide structural integrity and protection, while yeasts and fungi also possess cell walls made of chitin (in fungi) or glucan (in yeasts), which are crucial for their growth and overall stability. Understanding the structural differences among these groups is essential in microbiology, as it influences their physiology, ecology, and response to treatments such as antibiotics, which target specific cell wall components.