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protozoan    音标拼音: [pr,otəz'oən]

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  • Protozoan | Definition, Parasites, Diseases, Characteristics, Size . . .
    Protozoan, organism, usually single-celled and heterotrophic (using organic carbon as a source of energy), belonging to any of the major lineages of protists and, like most protists, typically microscopic All protozoans are eukaryotes and therefore possess a “true,” or membrane-bound, nucleus
  • Protozoan - Cell Structure, Nutrition, Reproduction | Britannica
    Protozoan - Cell Structure, Nutrition, Reproduction: 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 Like all membranous structures in the eukaryotic cell, the plasma membrane is composed of mostly lipid and some
  • Microbiology - Protozoa, Eukaryotes, Unicellular | Britannica
    Microbiology - Protozoa, Eukaryotes, Unicellular: Protozoa, or protozoans, are single-celled, eukaryotic microorganisms Some protozoa are oval or spherical, others elongated Still others have different shapes at different stages of the life cycle Cells can be as small as 1 μm in diameter and as large as 2,000 μm, or 2 mm (visible without magnification) Like animal cells, protozoa lack
  • Structure and classification of protozoan | Britannica
    Protozoan shapes vary, but all share such eukaryotic features as lipid-protein membranes and membrane-enclosed vacuoles and organelles (see eukaryote) They show wide variation in modes of movement, nutrition, and reproduction Various classification systems exist to group the protozoans
  • Protozoan - Parasites, Pathogens, Disease | Britannica
    Protozoan - Parasites, Pathogens, Disease: Parasitic protozoans have invaded and successfully established themselves in hosts from practically every animal phylum The best-studied parasitic species are those of medical and agricultural relevance The trypanosomes, for example, cause a number of important diseases in humans African sleeping sickness is produced by two subspecies of
  • Protozoan - Unicellular, Microscopic, Diversity | Britannica
    Protozoan - Unicellular, Microscopic, Diversity: Protozoans range in diameter from a few thousandths of a millimetre to several millimetres Because the group contains many unrelated or loosely related organisms, enormous diversity in structure and form exists The flagellated protozoans range from a simple oval cell with one or more flagella to the structural sophistication of the collared
  • protozoan - Students | Britannica Kids | Homework Help
    The protozoan benefits from the food that the photosynthetic species produces In many cases the photosynthetic cell lives inside the protozoan Some of the numerous protozoan species went extinct, others survived, and new species evolved Some protozoan species, particularly those that lived in the oceans, lived in broad areas around the world
  • Protozoan - Evolution and paleontology | Britannica
    Protozoan - Evolution and paleontology: Protists were a dominant form of life on Earth 1 5 billion years ago While protozoans evolved early and have survived to the present day as unicellular organisms, they have undoubtedly undergone considerable evolutionary change That many species must have become extinct as others appeared can be deduced from the limited fossil record of protozoans
  • Protozoan - Adaptations, Nutrition, Movement | Britannica
    Protozoan - Adaptations, Nutrition, Movement: For the most part, parasitic protozoans live in a fairly constant environment Temperature fluctuates very little, or not at all, inside the host, desiccation is not a risk, and food is in constant supply Free-living protists, on the other hand, face short- or long-term changes in temperature, aquatic acidity, food supply, moisture, and light





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