Protists

ProtistsFrom Bacteria to Plants Chapter 3.1

Pages 80-89

The Junk Drawer Kingdom• All protists are Eukaryotes: organisms that

have cells with a nucleus• Protists vary widely…– Some unicellular, some multicellular– Some heterotrophic, some autotrophic– Some mobile, some immobile

• Divided into 3 categories.

Animal-like

• Known as Protozoans–Protozoan are

heterotrophs (cannot make own food)–Able to move freely–Are unicellular

• Are 4 different types.

Protozoans: Types I & IISarcodines

• Have bulges of the cell membrane that fill with cytoplasm called Pseudopods (false foot)

• Use this ‘foot’ for movement

• Also use it to trap food.

Ciliates• Have organelles called

Cilia, hair-like structures that move like a wave

• Used to move, obtain food, and sense like whiskers.

Protozoans: Types III & IVZooflagellates

• Posses flagella, used for locomotion

• Live inside other organisms• When both organisms

benefit from a relationship, it is a type of symbiosis called Mutualism

Sporozoans• Are parasites• Move in a variety of ways

– On their own (flagella / slime)

– Or depend on host• Can feed off multiple

hosts, like Plasmodium– Humans and Mosquitoes

spread malaria (fever & chills).

Fungus-like Protists

• Heterotrophs• Have cell walls• Reproduce using Spores: tiny cell that grows into a new organism• Able to move at some point.

Live inwater

Live inmoist

places

Look

fuzz

y or

thre

adlik

eWater Molds Downy Mildews

Fungus Among Us• Slime Molds live in moist soil or decaying

plants & trees– Often brightly colored

• Move using pseudopods• Feed on other bacteria

Plantlike Protists• Called Algae• All are autotrophs• Can live in groups of

several thousand called Colonies

• Differentiated by color of chemicals or Pigment.

-Most live in water, but

some found in moist soil

-Unicellular, Multicellular or

Colonies

-Deep water seaweeds

-Pigments are good at

absorbing sunlight at

great depth

-Common seaweed

-Live in cool waters

-Can be very large and

create ‘forests’

Green Algae Red Algae Brown Algae

What to Work On

• Read textbook pages 80-89• Answer the Section 3.1 Review questions

on page 89 (#’s 1-3)

DUE: Friday, October 21st