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Chapter 28
Protists - Campbell & Reece 8th Ed.
40
Biology
Undergraduate 2
05/04/2010

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Term
Protist
Definition
An informal term applied to any eukaryote that is not a plant, animal or fungus.Most Protists are unicellular, though some are colonial or multicellular.
Term
Mixotrophs
Definition
An organism that is capable of both photosynthesis and heterotrophy.
Term
Secondary Endosymbiosis
Definition
A process in eukaryotic evolution in which a heterotrophic eukaryotic cell engulfed a photosynthetic eukaryotic cell, which survived in a symbiotic relationship inside a heterotrophic cell.
Term
Excavata
Definition
One of five supergroups of eukaryotes proposed in a current hypothesis of the evolutionary history of eukaryotes.Excavates have unique cytoskeletal features, and some species have an "excavated" feeding groove on one side of the cell body.
Term
Diplomonad
Definition
A protist that has modified mitochondria, two equal-sized nuclei, and multiple flagella.
Term
Parabasalid
Definition
A protist, such as a trichomonad, with modified mitochondria.
Term
Euglenozoan
Definition
Member of a diverse clade of flagellated protists that includes predatory heterorophs, photosynthetic autotrophs, and pathogenic parasites.
Term
Kinetoplastid
Definition
A protist, such as a trypanosome, that has a single large mitochondrion that houses an organized mass of DNA.
Term
Euglenid
Definition
A protist, such as Euglena or its relatives, characterized by an anterior pocket from which one or two flagella emerge.
Term
Chromalveolata
Definition
One of five supergroups of eukaryotes proposed in a current hypothesis of the evolutionary history of eukaryotes.chromalveolates may have originated by secondary endosymbiosis and include two large protist clades, the alveolates and the stramenopiles.
Term
Alveolate
Definition
A protist with membrane-bounded sacs (alveoli) located just under the plasma membrane.
Term
Dinoflagellate
Definition
Member of a group of mostly unicellular photosynthetic algae with two flagella situated in perpendicular grooves in cellulose plates covering the cell.
Term
Apicomplexan
Definition
A protist in a clade that includes many species that parasitize animals.Some apicomplexans cause human disease.
Term
Ciliate
Definition
A type of protist that moves by means of cilia.
Term
Stramenopile
Definition
A protist in which a "hairy" flagellum (one covered with fine, hairlike projections) is paired with a shorter, smooth flagellum.
Term
Diatom
Definition
A unicellular photsynthetic alga with a unique glassy cell wall containing silica.
Term
Golden Alga
Definition
A biflagellated, photosynthetic protist named for its color, which results from its yellow and brown carotenoids.
Term
Brown Alga
Definition
A multicellular, photosynthetic protist with a characteristic brown or olive color that results from carotenoids in its plastids.Most brown algae are marine, and some have a plantlike body (thallus).
Term
Thallus
Definition
A seaweed body that is plantlike, consisting of a holdfast, stipe, and blades, yet lacks true roots, stems, and leaves.
Term
Holdfast
Definition
A rootlike structure that anchors a seaweed.
Term
Stipe
Definition
A stemlike structure of a seaweed.
Term
Blade
Definition
A leaflike structure of a seaweed that provides most of the surface area for photosynthesis.
Term
Alternation of Generations
Definition
A life cycle in which there is both a multicellular diploid form, the sporophyte and a multicellar haploid form, the gametophyte; characteristic of plants and some algae.
Term
Heteromorphic
Definition
Referring to a condition in the life cycle of plants and certain algae in which the sporophyte and gametophyte generations differ in morphology.
Term
Isomorphic
Definition
Referring to alternating generations in plants and certain algae in which the sporophytes and gametophytes look alike, although they differ in chromosome number.
Term
Oomycete
Definition
A protist with flagellated cells, such as a water mold, white rust, or downy mildew, that acquires nutrition mainly as a decomposer of plant parasite.
Term
Rhizaria
Definition
One of five supergroups of eukaryotes proposed in a current hypothesis of the evolutionary history of eukaryotes; a morpholoigically diverse protist clade that is defined by DNA similarities.
Term
Amoeba
Definition
A protist grade characterized by the presence of pseudopodia.
Term
Pseudopodium
Definition
A cellular extension of amoeboid cells used in moving and feeding.
Term
Foram (Foraminiferan)
Definition
An acquatic protist that secretes a hardened shell containing calcium carbonate and extends pseudopodia through pores in the shell.
Term
Radiolarian
Definition
A protist, usually marine, with a shell generally made of silica and pseudopodia that radiate from the central body.
Term
Archaeoplastida
Definition
One of five supergroups of eukaryotes proposed in a current hypothesis of the evolutionary history of eukaryotes.This monophyletic group, which includes red algae, green algae and land plants, descended from a ancient protist ancestor that engulfed a cyanobacterium.
Term
Green Alga
Definition
A photosynthetic protist, named for green chloroplasts that are similar in structure and pigment composition to those of land plants.Green algae are a paraphyletic group, some of whose members are more closely related to land plants than they are to other green algae.
Term
Unikonta
Definition
One of five supergroups of eukaryotes proposed in a current hypothesis of the evolutionary history of eukaryotes.This clade, which is supported by studies of myosin proteins and DNA, consists of amoebozonas and opisthokonts.
Term
Amoebozoan
Definition
A protist in a clade that includes many species with lobe or tube shaped pseudopodia.
Term
Plasmodial Slime Molds
Definition
A type of protist that has amoeboid cells, flagellated cells, and a plasmodial feeding stage in its life cycle.
Term
Plasmodium
Definition
A single mass of cytoplasm containing many diploid nuclei that forms during the life cycle of some slime molds.
Term
Cellular Slime Molds
Definition
A type of protist that has unicellular amoebioid cells and aggregated reproductive bodies in its life cycle.
Term
Opisthokont
Definition
Member of the diverse clade Opisthokonta, organisms that descended from an ancestor with a posterior flagellum, including fungi, animals and certain protists.
Term
Producer
Definition
An organism that produces organic compounds from CO2 by harnessing light energy (in photosynthesis) or by oxidizing inorganic chemicals (in chemosynthetic reactions carried out by some prokaryotes).
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