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ap biology chapter 28 Flashcards

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5916838857Protistsmostly, unicellular, very complex, most nutritionally diverse eukaryotes that are not plants, animals or fungi0
5916838858mixotrophscombining photosynthesis and heterotrophic nutrition1
5916838859Three groups of protistsAlgal protists, ingestive protoxoans, and absorptive fungus like protists2
5916838860secondary endosymbiosisthey were ingested in the food vauole of a heterotrophic eukaryote and became endosymbionts themselves; red/green algae underwent this3
5916847104Excavata (clade)"excavated" feeding groove on one side of the cell body. excavates include the diplomonads, the parabasalids, and the euglenozoans. mixtotrophs4
5916838861Diplomonads and parabasalidsare found in anaerobic environments. These protists lack plastids and have modified mitochondria. mixotrophs5
5916838862Diplomonadsphyum metamonads ○ Mitosomes (modified mitochondria) lack functional electron transport chains ○ The diplomonads obtain energy from anaerobic biochemical pathways such as glycolysis. Diplomonads have two equal-sized nuclei and multiple flagella. mixotrophs6
5916838863parabasalidsPhylum Metamonada reduced mitochondria called hydrogenosomes that generate energy anaerobically, releasing hydrogen gas as a by-product. include trichomonads, ex- trichomonas vaginalis mixtrophs7
5916838864Phylum Euglenozoakinetoplastids and euglenids; distinguished by the presence of a spiral, or crystalline rod inside their flagella mixotrophs8
5916838865Kinetoplastidsbelong to euglenozoa; have a single, large mitochondrion that contains and organized mass of DNA called a kintoplast; symbiotic and include pathogenic parasites moist environments9
5916838866Euglenidsbelong to euglenozoa; have one to three flagella at their apical (leading)end. no cellulose wall,they have thin, protein strips called pellicles that wrap over their cell membranes. They can become heterotrophic in the absence of light. Some have an eyespot that permits phototaxis, the ability to move in response to light.10
5916838867alveolataa clade whose members have alveol under the plasma mebrane; include flagellated protists-Dinoflagellates, parasites Apicomplexans and Ciliates11
5916838868alveolismall membrane-bound cavities12
5916838869Dinoflagellatesspecies characterized by cells that are reinforced by internal plates of cellulose. Two flagella sit in perpendicular grooves in this "armor" and produce a spinning movement. can cause red tides mixotrophic13
5916838870Apicomplexanspart of alveolata; are parasites of animals; can cause human disease ex-plasmodium (malaria); They are characterized by an apical complex, a complex of organelles located at an end (apex) of the cell. have intricate life cycles with both sexual/asexual stages with spores as method of motility no motility14
5916838871Sporozoitesparasites spread throught heir host as tiny infectious cells15
5916838872Ciliatespart of alveolata, a diverse group of protists named for their use of cilia to move and feed; has two types of nuclei, one large micronuclei (handles day to day functions), and tiny micronuclei (handles reproductions) reproduce asexually by binary fission or by conjugation paramecium16
5916838873apicoplasta nonphotosynthetic plasmid that carries out vital functions including the synthesis of fatty acids; part of the apicomplexan17
5916838874conjugationconjugation, a sexual phenomenon in which Paramecia of compatible mating types fuse temporarily and exchange genetic material. During conjugation, the micronuclei of each conjugant divide by meiosis and the haploid gametes pass from one cell to the other. The gametes of each organism then fuse to form diploid micronuclei. The old macronuclei are destroyed, and new ones are developed from the new micronuclei. no tube and differs from bacterial conjugation occurs due to environmental stresses18
5916838875stramenopila(Stramen, straw; and pilos, hair) a clade that include both hterotrophic and phtosynthetic protists; refers to flagellum with numerous fine, hairlike projections19
5916838876Oomycetesbelong to stramenopila; cellulose walls , The filaments of Oomycota lack septa, Because they lack septa, they are coenocytic, containing many nuclei within a single filament water molds, downy mildews, and whiterusts have multinucleate filaments that resemble fungal hyphae; diploid dominant; flagellate spores, asexual and sexual; no plastids; decomposers;20
5916838877zoosporea motile, flagellated spore21
5916838878diatomsbelong to stramenopila; are unicellular algae unique glasslike walls composed of hydrated silica embedded in an organic matrix;22
5916838879Golden Algae (phylum)Chrysophytes (chrysos, golden) belong to stramenopiles; are named for their yellow and brown carotenoids; cells are biflagellated; most are unicellular;23
5916838880brown algae (phylum)Phaeophytes (phaios, dusky brown); that largest and most complex protists known, all are multicellular, and most are marine; they owe their color to carotenoids in their plastids;24
5916838881seaweedlargest marine algae, includes brown, red, and green algae; have a complex multicellular anatomy; they are analogous to plants25
5916838882thallus(thallos, sprout) a seaweed bod that is plantlike but lacks true roots, stems and leaves26
5916838883holdfasta rootlike structure that anchors a seaweed27
5916838884stipea stemlike structure of a seaweed28
5916838885bladesa leafe like structure of a seaweed that provides most of the surface area for phtosynthesis29
5916838886alternation of generationsthe alternation of multicellular haploid and diploid forms, had a convergent evolution in the life cycle of plants; some algae still produce like this30
5916838887Sporophytediploid individual produces haploid spores (zoospores) by meiosis31
5916838888gametophytethe haploid individual produces gametes by mitosis that fuse to form a diploid zygote32
5916838889heteromorphicthe sporophyte and gametophyte are structurally different in laminaria33
5916838890isomorphicwhich the sporophytes and gametophytes look similar to each other, although they differ in chromosome number, occurs in other algal life cycles34
5916838891Cercozoaa new clade taht contains the amoebas, and those that belong here are distinguished by their thread like pseudopodia; include the Chloraachniophytes and foraminiferans and related to radiolarians35
5916838892Amoebarefer to protists that move and feed by means of pseudopodia, not a monophyletic group;36
5916838893pseudopodiacellular extensions that bulge from the cell surface; when an amoeba moves it extens a pseudopodium and anchors the tip; cytoplasm then streams into the pseudopodium37
5916838894Foraminiferans (phylum)belong to cercozoa; named for their porous shells or tests; have multichambered tests hardenedwith calcium carbonate; Pseudopodia extend through the pores for swimming, test formation, and feeding.38
5916838895radiolarians (phylum)part of the cercozoa; mostly marine protists whose silica skeletons are fused into one delicate piece; pseudopodia known as axopodia radiate from the central body and are reinforced by microtubules; after death tests accumulate as an ooze that may be 100's meters thick in some seaflor locations39
5916838896Amoebozoansmany species of amoebas that have lobe-shaped pseudopodia belong to this clade includes gymnamoebas, entamoebas, and slime molds40
5916838897gymnamoebasa large and varied group of amoeboxoans;41
5916838898entamoebasbelong to amoeboxoans; include free living and parsitic species,42
5916838899Slime moldsmycetoxoans (fungus animals); belong to amoebozoans; one thought to be fungi b/c they produce fruiting bodies that disperse their spore;but not. have diverged into two lineages with distinctive life cycles: plasmodial slie molds and cellular slime molds43
5916838900Plasmodial slime moldsbrightly pigmented heterotrophic organisms; not multicellular, but rather a single mass of cytoplasm with multiple diploid nuclei that undergo synchronous mitotic divisions with no cytokinesis , primarily diploid44
5916838901plasmodial slime moldthe feeding stage of an amoeboid mass, with no more resources, stalks bearing spore capsules form. Haploid spores released from the capsule germinate into haploid amoeboid or flagellated cells, which fuse to form a diploid cell.45
5916838902Cellular slime moldsunicellularity and multicellularity; feeding stage consits of solitary cells that feed and divide mitotically as individuals; When food is scarce, the cells form an aggregate that functions as a unit, though cell remains separated by their membranes;46
5917081468cellular slime mold cyclewhen food sources are scarce --->aggregate cells (slug) form stalk with capsule full of spores spores form haploid amoeba protists dominant stage in a cellular slime mold is the haploid stage. Only the zygote is diploid, produces amoebas, not stalk stimulus for aggregation is (cAMP), which is secreted by the amoebas that experience food deprivation first.47
5916838903red algae(rhodophytes, rhodos-red) closest relatives of plants; have no flagellated stages in thier life cycle; red due to the pigment phycoerythrin; coloration depends on the depth that they inhabit; most are multicellular; thalli of red algal are filamentous; life cycles are especially diverse; alternation of generations is common48
5916838904green algaeclosest relatives of plants; named for their grass-green chloroplasts; divided into two main chropus- Chlorophtes, and charophyceans49
5916838905Chlorophytespart of green algae; live in fresh water but many are marine inhabitants; some live in damp soil, other on glaciers and snowfields; some live symbiotically with fungi to form lichens50
5916838906Large size and complexity in chlorphyteshas evolved by three different mechanisms; formation of colonies of individual cells; the repeated division of nuclei w/o cytoplasmic division to form multinucleate filaments; the formation of true multicellular forms by ell division and cell differentiation51
5916838907Charophyceansthe other group of green algae is most closely related to land plants52
5917066890Rhizariachlorarachniophytes, forams, and radiolarians53

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