Protozoa are microscopic unicellular eukaryotes that have a relatively complex internal structure and carry out complex metabolic activities. Some protozoa have structures for propulsion or other types of movement. On the basis of light and electron microscopic morphology, the protozoa are currently classified into six phyla.

Protozoa (sg.: protozoan or protozoon; alternative plural: protozoans) are a polyphyletic group of single-celled eukaryotes, either free-living or parasitic, that feed on organic matter such as other microorganisms or organic debris. [1][2] Historically, protozoans were regarded as …

Essentially, protozoa are single-celled eukaryotes. This means that they are single celled organisms that have a nuclei as well as a number of other important organelles within the cytoplasm and enclosed by a membrane. They exist as free-living organisms or as parasites.

Feb 28, 2025 · The protozoan cell carries out all of the processes—including feeding, growth, reproduction, excretion, and movement—necessary to sustain and propagate life. The cell is enclosed in a membrane called the plasma membrane.

Aug 3, 2023 · Protozoa are unicellular eukaryotic microorganisms having a membrane-bound nucleus and other organelles within their cells. Despite their small size, they are incredibly diverse and exist in various aquatic and terrestrial environments worldwide.

The protozoa are structurally equivalent to a single metazoan cell: basically, a mass of cytoplasm bounded by some kind of limiting membrane and containing one or more nuclei.

ANATOMY AND PHYSIOLOGY OF THE PROTOZOA process. This system has the merit of removing free hematin from the protozoan's cytoplasm, hematin being an inhibitor of succinic dehydro genase, a Krebs' cycle enzyme.

Oct 20, 2024 · Protozoa, as single-celled eukaryotes, possess a complex cellular architecture that supports their functions and adaptability. Central to their structure is the nucleus, housing the organism’s genetic material. This organelle can vary in …

Protozoa is a general term applied to a large and diverse group of eukaryotic unicellular motile microorganisms that belong to what is now known as the kingdom Protista. Members of this kingdom can be free-living and saprophytic, commensal, symbiotic, or parasitic.

Apr 28, 2017 · Organisms known as protozoa include a wide range of organisms, most of which are free-living single-celled eukaryotes. Therefore, protozoa fit into the Domain Eukarya.