PROTISTS

“No more pleasant sight has met my eye than this of so many thousands of living creatures in one small drop of water.”Anton van Leeuwenhoek

Where did the body come from?

Sample from Victim’s Lung Discovery Site

Lake Leaside Lake Northern Lake Lawrence

Evolution of Prokaryotes to Evolution of Prokaryotes to EukaryotesEukaryotes

How did the simple prokaryotic cell make the leap into a more complex eukaryotic cell?

• Theory of Endosymbiosis

EndosymbiosisEndosymbiosis

Evidence of Evidence of EndosymbiosisEndosymbiosis

symbiosis of mitochondria happened early, as all eukaryotes have them

Symbiosis of chloroplasts were later

Kingdom ProtistaKingdom ProtistaCharacteristics:EukaryotesMicroscopicLive in environments with waterConsidered “grab bag” of

species:◦Consist of eukaryotic organisms that

do not fit into Kingdom Fungi, Animalia or Plantae

Protists are not animals, plants or fungi

Animal-likeProtozoans

Plant-like Fungus-likeCharacteristicsCharacteristics

Animal-like Plant-like Fungus-like

Green algae

flagellatesRed algae

Amoeba

kelp

paramecium

Euglena

Water mould

Slime Mould

Tree slime mould

Types of ProtozoansTypes of Protozoans4 types:ZooflagellateAmoeba (Sarcodines)CiliateSporozoan

AmoebaAmoeba

Watch Amoeba Video:http://www.youtube.com/watch?v=W6rnhiMxtKU&feature=related

2. Plant like Protists2. Plant like ProtistsTypes:EuglenoidsAlgae

Question: Why can euglenoids not be classified in Kingdom Plantae?

RED ALGAE

•Multicellular seaweeds found in mainly warmer seawater

•Seaweed important industry

SLIME AND WATER SLIME AND WATER MOULDSMOULDS

ReproductionReproductionAnimal-like and plant-like protists can

reproduce sexually and asexually.

Asexual Reproduction

Sexual Reproduction

Protists in our Everyday Protists in our Everyday LivesLivesParasitic protists can cause diseases when it they come into contact with the human body◦Example: malaria,

sleeping sicknessdysentery

Protists in our Everyday Protists in our Everyday LivesLives

Algae ◦Food indusry

Seaweed can be eaten. Example: sushi Beta-carotene from green algae is yellow-

orange food colouring◦Medicine

Used for curing arthritis, influenza, tuberculosis

Cosmetics Carrageenan – acts like thickening agents

in shampoo◦Abrasives substances

Found in polishes and toothpaste◦Fertilizer

Used on gardens