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Fundamentals of Bio II - Microbial Eukaryotes
Microbial Eukaryotes
28
Biology
Undergraduate 2
06/07/2010

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Term
Chromalveolates
Definition

Clade Alveolata (alveolates)

 

Clade Stramenopila

Term
Clade Alveolata (alveolates)
Definition

Have alveoli (sacs) beneath their plasma membrane that support the cell surface.

Includes:

 

  • Apicomplexa
  • Dinoflagellates
  • Ciliates

 

Term
Apicomplexa
Definition

Apical Complex for host penetration, complex life cycle including sexual and asexual reproduction. 


Ex. Plasmodium - causative agent of Malaria. Vector - female Anopholes mosquito


Sexual takes place in mosquito, asexual in humans.


Term
Dinoflagellates
Definition

Marine. Armor of cellulose plates, photoautotrophs and heterotrophs, spinning movements produced by 2 flagella, rapid growth of some dinoflagellate populations causes Red tides.


Ex. Ceratium Hirundinella


Nonphotosynthetic - zooplankton

Term
Ciliates
Definition

Use cilia to move and feed.  Large macronuclei / small micronuclei.  Micronucleus functions during conjugation.  Conjugation in Paramecium is a sexual process of genetic recombination, but is not a reproductive process.  The same 2 cells begin the process and are there at the end, no new cells

 

Ex. Paramecium mutimicronucleatum 

Term
Clade Stramenopila (stramenopiles)
Definition
Hairy and smooth flagella, some stramenpolies lack flagella, like Diatoms that male gamates only have flagella.  Biflagellated 
Term
Diatoms
Definition
Unicellular organisms surrounded by a two part glass-like (silica) SiO2 siliceous) wall.  Major component of phytoplankton.  Carotenoids in choloroplasts give them a yellowish or brown color.  Fresh water and marine habitats.  All make chrysolminarin (carbohydrate) and oils as photosynthetic storage products.
Term
Brown Algae (Phaeophyta)
Definition

Multicellular ONLY.  MOSTLY marine helps are large, like the Macrocystis may be up to 60 meters long.  Some float in mats, like Sargassum.  Most are attached by a HOLDFAST

 

Ex. Laminaria, Ectocarpus, Sargassum

Term
Oomycetes
Definition
Nonphotosynthetic stramenopile group.  Water molds and downy mildews. They are decomposers or parasitic.  Have filaments (hyphae) that facilitate nutrient uptake.  Phytophora infestans caused the potato famine in Ireland during the 1840s.
Term
Plantae
Definition

This is a clade containing several other clades including red algae (rhodophyta), land plants, chlorophytes, and charophytes.


Used to be caled land plants, recognized as descendants of green and red algae.  All are photosynthetic and contain chloroplasts; 2 clades of "green algae" chlorophytes and charophytes.  Contain chlorophylls a and b, and starch is their storage product.  Storage carbohydrates - Amylose / Amylopectin

Term
Red Algae (Rhodophyta)
Definition

Colors ranging from green to black because of phycoerythrin.  MOST are multicellular, largest are seaweeds.  Most abundant large algae in coastal waters of the tropics.  Chlorophyll a and c present no flagellated stages


Ex. Porphyra (sushi wrapper)

Term
Chlorophyta (chlorophytes)
Definition

Green algae, chlorophyll a and b present, 17,000 + species MOSTLY freshwater, SOME marine, SOME moist terrestrial.


Exs. Spriogyra, Ulva (Sea Lettuce)

Term
Charophytes (Charales) called "Stoneworts"
Definition

The land plants probably evolved from a common ancestor shared with the Charales

 

Ex. Chara

Term
Excavates
Definition
Term
Diplomonads (Diplomonadida)
Definition

Unicellular, parasitic, lack mitochondria


Ex.  Giardia lamblia - contaminates water supplies and causes intestinal disease giardiasis.  2 equal sized haploid nuclei

Term
Parabasalids (Parabasalida)
Definition

No mitochondria, locomotion by flagella and undulating membrane


Exs: Trichomonas vaginalis - causes sexually transmitted disease in humans

    Trichonympha - Symbiont found in the gut of termites

Term
Heteroloboseans
Definition
Include Naegleria fowleri also known as "the brain eating amoeba."  Free living organism found in warm freshwater (77 - 95 degrees F) in either an amoeboid or temporary flagellate stage Amoebas of Naeglaria can invade the central nervous system via the nose and be fatal in a disease called primary amoebic meningoencephalitis (PAM)
Term
Euglenids
Definition

Unicellar and flagellated diverse nutritional requirements many species are fully autotrophic in the sun and shift to heterotrophy in the dark, called "MIXOTROPHIC".

 

Euglena has a unique storage carbohydrate called paramylon

Term
Kinteoplastids
Definition

Have a large mitochondrion which contains a kinteoplast - a unique structure housing multiple circular DNA molecules and associated proteins


Parastic kinetoplastids ex. Trypanosoma brucei rhodesiense, cause African Sleeping Sickness (Trypanosomiasis).  The vector/carrier is the Tsetse fly, or Glossina

Term
Rhizaria
Definition

Unicellular, aquatic, mostly amoeboid.

 

 

  • Foraminifera (Foram)
  • Radiolarians

 

Term
Foraminifera (Foram)
Definition
Marine and freshwater amoebas with porous, generally multi-chambered (multiocular) shells (tests) made of calcium carbonate, CaCO3 (calcareous).  Pseudo-podia extend through the pores.  Form tests in marine sediments form an extensive fossil record.
Term
Radiolarians
Definition

Most have fused tests made of silica (SiO2, Siliceous) which constitute an internal skeleton (endoskeleton)


Found EXCLUSIVELY in marine environments.  Ingest microorganisms by phagocytosis using their pseudopodia, which radiate from their central body.

 

Term

Unikonts

 

Definition

If flagella are present, they are single.  Animals and fungi are both believed to have arisen from a common ancestor within the opisthokont clade.


Clade Opisthokont


Clade Amoebozoa

Term
Clade Amoebozoa
Definition

Amoebas with lobe-shaped pseudopods.

 

Ex. Loboseans, Plasmodial Slime Molds, Cellular Slime Molds

Term
Loboseans
Definition

Consists of a single cell.  Unlike cells of slime molds, they don't aggregate.  Feed by phagocytosis using pseduopods.  Move by psedupods.


Ex. Amoeba proteus

Term
Plasmodial Slime Molds
Definition

Plasmodium or feeding stage is a wall-less mass of cytoplasm with numerous diploid nuclei (coenocytic or multinucleate).  The plasmodium extends pseudopodia through decomposing material engulfing food by phagocytosis.  


Ex.  Physarum

Term
Cellular Slime Molds
Definition
From multicellular aggregates in which the cells remain separated by their membranes (pseudoplasmodium)
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