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.