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    Protista

    Biology

    Study Guide
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      • Introduction
      • Algae
      • Problems
      • Protozoa
      • Problems
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      • Problems
    • Terms

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    Terms

    Terms
    • Alternation of generations

      A reproductive strategy that involves a succession of haploid and diploid phases.

    • Ameboid motion

      Type of motion in which cytoplas can flow beneath the cell membrane into new branches called pseudopods, helped by filaments of a structural protein called actin, causing the cell to move in a given direction.

    • Cilia

      Short hair-like projections found on eukaryotic cells that can help the cell move or can sweep food particles toward the mouth.

    • Chlorophyll

      The pigment found in green plants and algae that allows them to undergo photosynthesis

    • Chloroplasts

      The organelles in which photosynthesis takes place in green plants and algae.

    • Endosymbiotic theory

      This theory states that eukaryote organelles may have evolved when large eukaryotic organisms engulfed but did not digest smaller organisms and a symbiotic relationship arose.

    • Isogamus

      An organism that has only one type of gamete rather than separate male and female gametes.

    • Macronucleus

      In ciliates, the large nucleus that holds many copies of the cells genetic material. It is responsible for the growth and metabolism of the cell.

    • Micronucleus

      In ciliates, the smaller nucleus responsible for the transmission of genetic material during sexual reproduction.

    • Oral groove

      In ciliates, the membrane structure that functions in food uptake.

    • Pinocytosis

      Method of food uptake in which a liquid or small food particle is sucked into an invagination in the cell membrane, which then folds in on itself and pinches off from the cell membrane to become a small vacuole.

    • Phagocytosis

      Method of food uptake in which a flexible portion of the cell membrane surrounds a food particle and engulfs it, bringing it into the cell in a vacuole. Phagocytosis is used to ingest other unicellular organisms or large particles.

    • Photosynthesis

      The process in which some organisms can use the energy of light to transform inorganic materials into usable organic materials.

    • Plankton

      Small free-floating organisms in fresh- and saltwater that are a major marine food source.

    • Plasmodium

      The diploid vegatative phase of acellular slime molds

    • Pseudoplasmodium

      The haploid slug-like phase of cellular slime molds that gives rise to the fruiting body.

    • Pseudopods

      Temporary cytoplasmic protrusions of ameboid cells that function in movement and food uptake by phagocytosis.

    • Stigma

      The light sensative region in euglenoids that allows them to move toward light sources.

    • Thallus

      The leaf-like bodies of algae.

    • Vacuole

      A membrane bound portion of the cell usually used for holding materials such as food and waste.

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