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