Chapter 7

Section 1

What is a Protist?

Eukaryotes, (have nuclei) Live in moist surroundings. Most are unicellular, but some are

multicellular. Some are heterotrophs, some are autotrophs,

and a couple are both.

Grouping Protists

Three categories: animal-like fungus like plantlike

Animal-like Protists also called

protozoans are

heterotrophs. Most can move

from place to place to get food.

Animal-like Protists Many protozoans

that live in fresh water have contractile vacuoles.

Animal-like Protists

Four types: sarcodines ciliates, flagellates sporozoans

Animal-like Protists Sarcodines move

and feed by using pseudopods.

Pseudopods are temporary bulges of the cell membrane that fill with cytoplasm.

Animal-like Protists Ciliates are covered with hairlike projections

called cilia. They use cilia to move, obtain food, and

sense the environment.

Animal-like Protists Zooflagellates move using whiplike flagella.

Animal-like Protists

Sporozoans are parasites that feed on their hosts’ cells and body fluids.

Plasmodia attacking RBC

Funguslike Protists heterotrophs, have cell walls use spores to

reproduce. Unlike fungi, all

funguslike protists are able to move at some point in their lives.

Dog vomit slime mold

Funguslike ProtistsThe three types: water molds downy mildews slime molds.

Slime mold fruiting bodies

Plantlike Protists Plantlike protists are

called algae. autotrophs variety of colors

because they contain many types of pigments—chemicals that produce color.

Plantlike Protists - Euglenoids

Euglenoids can become heterotrophic when sunlight is not available.

Plantlike Protists - Dinoflagellates covered by stiff

plates move using two

flagella. beautiful,

glasslike cell walls.

Plantlike Protists - Algae Green algae live in

fresh water, salt water, and moist places on land.

Red algae and brown algae live in the oceans.

Brown Algae