Lab - Protists
Introduction to Protists
• Domain – Eukarya
– WE WILL CONSIDER TWO INFORMAL GROUPS:
• Algae – – Autotrophic
– Unicellular, colonial or macroalgae
– Importance-
• Protozoa – Heterotrophic
– Unicellular
Symbiotic interactions
• Many protozoans are free-living
• Many form symbiotic relationships with other living things
– Parasitic
– Mutualistic
– Commensal
– Examples?
Algae
Ex: Euglena
* unicellular
* photosynthetic and heterotrophic
nucleus
chloroplast
contractile
vacuole
eyespot
gullet flagellum
* Know function of each structure
Algae
Ex: Green Algae
* unicellular & colonial forms
* considered evolutionary precursors of plants
Spirogyra
* spiral-shaped chloroplasts
* sexual reproduction: conjugation
chloroplast
nucleus
conjugation tube
zygote
young filament
Algae
Ex: Red Algae
* multicellular macroalgae
* often delicate with a feathery appearance
* impt in coral reef formation
Algae
Ex: Brown Algae
* multicellular macroalgae
* includes kelp & Sargassum
* impt habitat for marine organisms
float
float
blade
blade
stipe
stipe
holdfast
Sargassum
Fucus
Laminaria
Protozoans
Ex: Paramecium
* unicellular
* use cilia for locomotion
macronucleus
anal pore
contractile vacuole
oral groove
cilia
* Know function of each structure
micronucleus
food vacuole
Protozoans
Ex: Amoeba
* unicellular
* use pseudopodia for locomotion & prey capture
nucleus
pseudopodium
contractile vacuole
phagocytosis
* Know function of each structure
food vacuole
cytoplasm
Protozoans
Ex: Trypanosoma
* unicellular
* use flagellum for locomotion swim in the blood stream
* cause African Sleeping Sickness (vector: tsetse fly)
red blood cell
flagellum
Trypanosoma slide
Protozoans
Ex: Plasmodium
* unicellular
* cause malaria (vector: Anopheles mosquito)
* directly invade red blood cells for nutrition & reproduction
human host mosquito
liver
invasion of liver cells
reproduction w/in
liver cells
rupturing of new
parasites
invasion of red blood cells
reproduction w/in
blood cells
rupturing of blood cells
Protozoans
Ex: Plasmodium slide