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Protist: Euglenozoa

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Alicia Yn

on 16 February 2012

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Transcript of Protist: Euglenozoa

Euglenozoa Class Description found in both free-living and parasitic form Euglenoids
(Free-Living) It is hard to classify them as "plant" or "animal" because of the possession of mitochondria or chloroplast Kinetoplastids
(Parastic) contains a single mitochondrion in each cell called kinetoplast the mitochondria DNA have minicircles and maxicircles that is responsible for glycolysis and editing of the DNA Contains pellicle, which are flexible interlocking proteinaceous strips that allows the cell to change its shape Contractile vaculoes collect excess water to regulate osmotic pressure with the cell Contains stigma that helps them move towards light majority have two flagellas attached at the "reservoir" at the anterior of the cell for mobility some possess mitochondria and some possess chloroplasts through endosymbiosis with green algae Candidate Kingdom Kingdom Euglenozoa Unique Features the presence of paraxial rods in their flagellum Created by:
Darci Graefser
& Alicia Yn Since 1/3 are of the 40 genera of euglenoids have chloroplast they are fully autotrophic
Others lack chloroplasts, ingest their food, and are heterotrophic Nutritional Mechanism Photosynthetic euglenoids may sometimes feed on dissolved or particulate food through phagocytosis Some euglenoids with chloroplasts may become heterotrophic in the dark Reproduction Occurs by asexual binary fission
sexual reproduction is nonexistent in Kingdom Euglenozoa Divides through mitosis by absorbing their flagellum and produces 4-8 flagellated haploid cells, called zoospores
the nuclear envelope remains intact throughout the process Euglenozoas live in a variety of ecosystems, ranging from freshwater streams and ponds to the marine environment to the bloodstreams and systems of their hosts Due to their photosynthetic ability, they produce oxygen for other animals to breathe
the cycle of photosynthesis fixes carbon, which provides nutrition for plants and in turn, provides food for animals Ecological Role Kinetoplastids have mitochondria to produce their energy, and they feed on the blood and tissue of their host Euglena Leishmania Trypanosoma
(disease-causing kinetoplastids) Influences human populations through disease:
Trypanosomes cause three main diseases:
African Sleeping Sickness- lethargy/fatigue
Leishmaniasis- skin sores and affects internal organs
Chagas Disease- severe cardiac and digestive problems
1/3 of the 40 genera of euglenoids have chloroplasts Representative Species THE END.
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