Paramecium: A Representative Free-Living Ciliate
Paramecia are often described as slipper shaped. Paramecium caudatum is 150 to 300 µm in length and is blunt anteriorly […]
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Zoology
Phylum Euglenozoa: A Group with Flexible Pellicle
The Euglenozoa is generally considered a monophyletic group, based on the shared persistence of the nucleoli during mitosis, and the
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Phylum Porifera: Sponges
Most animals move to search for food, but a sessile sponge draws food and water into its body instead. The
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Reproduction of Protozoa
Reproduction Sexual phenomena occur widely among protozoa, and sexual processes may precede certain phases of asexual reproduction, but embryonic development
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Protozoa: Excretion and Osmoregulation
Vacuoles can be seen by light microscopy in the cytoplasm of many protozoa. Some of these vacuoles periodically fill with
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Protozoan Cell: What are They Made of?
Nucleus As in other eukaryotes, the nucleus is a membrane-bound structure whose interior communicates with the cytoplasm by small pores.
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Protozoan Locomotion: Cilia, Flagella and Pseudopodia
A cilium or flagellum has considerable internal structure. Each flagellum or cilium contains nine pairs of longitudinal microtubules arranged in
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What is Protozoa?
A protozoan, or unicellular eukaryote, is a complete organism in which all life activities occur within the limits of a
Pre-Cambrian Life: Appearance of Eukaryotes
Eukaryotes (“true nucleus”) have cells with membrane-bound nuclei containing chromosomes composed of chromatin. Constituents of eukaryotic chromatin include proteins called
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The Oparin-Haldane Hypothesis: Proof of Prebiotic Synthesis
The Oparin-Haldane hypothesis stimulated experimental work to test the hypothesis that organic compounds characteristic of life could be formed from
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