What are protozoans?

Protozoans are classified as single-celled eukaryotic organisms, which distinguishes them from multi-cellular organisms, bacteria, and viruses. Eukaryotic cells, unlike prokaryotic cells found in bacteria, possess a true nucleus and other membrane-bound organelles. This complex structure allows protozoans to carry out various metabolic processes and functions within a single cell.

Protozoans are diverse in form and function, exhibiting movement through various means, such as flagella, cilia, or pseudopodia. They can be found in a variety of environments, often thriving in moist habitats, and play significant roles in ecosystems, such as being part of the food web and contributing to nutrient cycling.

Understanding protozoans is essential in microbiology, especially in the context of human health, as some protozoans are pathogens that can cause diseases in humans, such as malaria and dysentery. Recognizing their single-celled nature is fundamental when studying these organisms and their impact on health and disease.