Archezoans and protists




Дата канвертавання24.04.2016
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ARCHEZOANS AND PROTISTS
ARCHEZOANS: oldest nucleated cells

-lack peroxisomes, have small ribosomes

-“relict” kingdom

-Archaeamoebae: phylum: multinucleate, unicellular

-

-Metamonad: phylum, most are parasitic, some free living



-

-ie.
-Microsporidia: phylum, all parasitic, infect mostly invertebrates

-

REMEMBER FROM CHAPTER 18: page 525…review:



  1. homophyletic:




  1. paraphyletic




  1. polyphyletic:


PROTISTS:

GENERALLY:

-

-



-

-

-




KINETOPLASTIDS: (the following are all phyla)

  • Parabasala-

-






  • Kinetoplasta

-ie.


  • Euglenoid:

-

-

-


GENUS: Euglena:



  • Amoeboid Protozoa (sarcodines)

-amoeba…asymmetric

-

ie.




ACTINOPODA

Ie.


ALVEOLATE PROTISTS

Except Suctoria, which have them absent as adults

-ie.


-

-

-Ciliates- two types of nuclei: Macro and Micro



Macro:

Micro:


Conjugation:




  • Dinoflagellates: usually unicellular alveolate organisms ( membraneous sacs)

-
-ie.


  • Apicomplexa: spore forming protists (sporozoa)

-

ie.
FLAGELLATED PROTOZOA: found in oceans, freshwater



  • Choanoflagellates…single flagella

  • Opalozoa…2 flagella, more divers, can dominate aquatic ecosystems.


MYCETOZOA: Slime molds…protozoan and funguslike during their lifecycle.

Found on damp soils, logs, decaying matter…red/yellow



  • True Slime Mold: vegetative phase, diploid,


-Feed on bacteria/organic matter, divide and produce daugther cells

-when food supply decreases …behavior changes based on environment…



  1. Asexual:


  1. Sexual:

cAMP is signal used by cellular slime molds to control aggregation (just like animals use cAMP in intracellular control


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