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Bikonts
Terms & Concepts
33
Biology
Undergraduate 1
12/12/2011

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Term
Synapomorphies of Bikonta
Definition
two flagellum
Term
Excavates
Definition
  • S: distinct molecular characteristics
  • S: ventral feeding groov present (lost in some groups)
  • S: disc-shaped cristae in the mitochondria
  • many lack a mitochondria yet it is believed that the common ancestory of all excavates possesed mitochondria
Term
Excavate: Diplomonads
Definition
  • Lack mitochondria
  • unicellular
Term
Excavate: Euglenids
Definition
  • S: flagella contain a crystalline rod not found in other organisms
  • not all possess chloroplasts
Term
Excavate: Kinetoplastids
Definition
  • Unicellular
  • two flagella
  • contains a kinetoplast, a unique structure containing multiple circular DNA molecules and associated proteins
Term
Chromalveolates
Definition
  • photosynthetic organism
  • typically have cell walls composed in part of cellulose
Term
Chromalveolates: Stramenopiles
Definition
  • S: plastids (large organelles) formed from secondary endosymbiosis with red algal ancestor (lost in some groups)
  • S: tubular crisae
  • possess one straight flagellum and one with hairs
Term
Chromalveolates: Alveolates
Definition
S: the presences of alveolis (sacs located just beneath their plasma membrane that is for support)
Term

Chromalveolates: Alveolates - Apicomplexan

Definition
S: apical complex
Term
Chromalveolates: Alveolates - Dinoflagellates
Definition
  • Most are important primary producers in marine ecosystems
  • are a distinctive brown color
  • cellulose skeleton
  • often possess two flagella
  • cause the red tide
Term
Chromalveolates: Alveolates - Ciliates
Definition
  • Have numeorus hairlike cilia
  • S: possesion of two trypes of nuclei
Term
Chromalveolates: Stramenopiles
Definition
  • S: possess one straight flagellum and one with tubular hairs yet it is only present during a short period of their lifecycle
  • Some members of the clade lack flagella



Term

Chromalveolates: Stramenopiles - Brown Algae

Definition
  • this clad generally possess the pigments fucoxanthin, plus chlorophyll a and c in their chloroplasts
  • multi-cellular
  • almost exclusively marine
Term

Chromalveolates: Stramenopiles - Diatoms

Definition
  • S:  presence of a two-piece cilia wall with many many holes/filters
  • used in chalk
  • unicellular, although species associate to form filaments
Term
Chromalveolates: Haptophytes
Definition
  • unequal smooth flagells
  • often armored with calcium carbonate scales
  • abundant member of marine phytoplankton
  • photosynthetics
  • unicellular
Term
Bikonta: Rhizaria
Definition
  • S: unique molecular characteristics
  • S: filose (thread-like) psudopodia
  • unicellular
  • aquatic
Term

Bikonta: Rhizaria - Foraminferans

Definition
  • S: secretion of calcium carbonate to form external shells
  • they are famous for having created vast limestone deposits
Term
Bikonta: Rhizaria - Radiolarians
Definition
characterized byt heir siliceous skeleton
Term
Bikonts: Archaeplastida - Plantae - Glaucophytes
Definition
  • Possess chloroplasts derieved through primary endosymbiosis 
  • Their chloroplast is unique mong plantae in that is has peptidoglycan incorporated b/t its inner and outer cell membrane (a feature shared with cyanobacteria)
Term

Bikonts: Archaeplastida - Plantae - Glaucophytes - Red Algae

Definition
  • S: one of the only photosynthetic eukaryotic groups that possesses phycoerythrins (photosynthetic pigment that absorbs red, yellow,orange, and green light) a trait also shared with cyanobacteria.
  • multi-cellular
Term

Bikonts: Archaeplastida - Plantae - Glaucophytes - Green Plants

Definition
  • S: possesssion of the pigment chlorophyll b and storage of starch
Term

Bikonts: Archaeplastida - Plantae - Green Plants - Chlorophytes

Definition
  • Contain chlorophylls a and b and form starch resrves of energy
  • Through secondary endosymbiosis a chlorphyte cecame the chloroplast of the euglanids.
  • They have alteration of generation
Term
Bikonts: Archaeplastida - Plantae - Green Plants - Land Plants
Definition
  • multicellular
  • photosynthetic
  • traits that aid a terrestrial life style
    • retain water - cuticle
    • regulate gas exchange b/t the plant & the environment - stomato
    • prevent dehydration - gametangia
    • prevent eggs from drying out - protected embryos
    • protection from uv rays - specialized pigments
  • alteration of generations life cycle
Term
Bikonts: Archaeplastida - Plantae - Green Plants - Land Plants - Nonvascular Land Plants
Definition
  • S: do not have a vascular system 
  • The sporophyte generation is smaller than the gametophyte generation
Term

Bikonts: Archaeplastida - Plantae - Green Plants - Land Plants - Nonvascular Land Plants - Liverworts

Definition
  • Though tto be the msot ancient surviving clade of land plants
  • Distinct in that their sporophyts are shorter than those of hornworts and mosses
Term

Bikonts: Archaeplastida - Plantae - Green Plants - Land Plants - Nonvascular Land Plants - Mosses

Definition
  • the first to develop stoma
  • most mosses are two cells thick tus allowing cell to cell diffusion of nutrients, water, adn wastes
  • spend the majority fo their lfie in gametophyte stage
Term

 

Bikonts: Archaeplastida - Plantae - Green Plants - Land Plants - Vascular Land Plants

 

Definition
  • S: Have a vascular system. All have tracheid
  • S:  a branchign idnependet sporophyte. Offers the advantage of producign more spores than the unbranching spores
  • The tracheid, elongated cells in the xylem that serve in the transport of water and mineral salts) was a significant developments because it provided a pathway for transport of water, allowng for it not to be necessary for land plants to be close to water.
Term

Bikonts: Archaeplastida - Plantae - Green Plants - Land Plants - Vascular Land Plants - Seedless Vascular Plants - Ferns

Definition
  • Sporophytes of ferns, like those of seed plants, have true roots, stems and leaves
  • Sporophyte stage dominates
  • Flagellated motile sperm
  • Diloid zygote develops directly from the gametophyte
Term
Bikonts: Archaeplastida - Plantae - Green Plants - Land Plants - Vascular Land Plants - Seed Plants
Definition
  • greatly reduced gametophytes
  • Now no need for gametes swimming in water
  • only plants that have wood
Term

Bikonts: Archaeplastida - Plantae - Green Plants - Land Plants - Vascular Land Plants - Seed Plants - gymnosperms

Definition
S: cone-bearing 
Term

Bikonts: Archaeplastida - Plantae - Green Plants - Land Plants - Vascular Land Plants - Seed Plants - Angiosperms

Definition
  • S: flowering plants
  • S: Their vascular tissues are unique in that they  contain distinctive cell types such as vessel elemetns, fibers, and companion cells that are rearely obsrved in other Plantae.
  • S: triploid endosperm b/c one sperm nucleu fertlizes the egg to form the zygote while thee other nucleus combines with the two polar nuclei to form the endosperm
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