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Protists
Chapter 8, Section 1
What is a Protist?

One or many celled eukaryotic
organism that lives in moist or wet
surroundings.


Remember, a eukaryotic cell does
have membrane bound organelles
and nucleus.
Belong to the kingdom, Protista.
How do Protists Reproduce?

Asexual Reproduction
Requires only one parent.
 For single celled protists:

• Hereditary material is duplicated.
• Nucleus and cytoplasm divides.
• The two resulting cells are genetically
identical.

For multiple celled protists:
• Part of the parent organisms breaks off
and grows into a new organism through
cell division.
How do Protists Reproduce?

Sexual Reproduction:
Meiosis produces gametes.
 Gametes fuse to form genetically
different offspring.

Classification of Protists

Divided into three groups based on
whether they share characteristics
with plants, animals, or fungi.
Classification of Protists

Plantlike Protists
Contain chlorophyll.
 Make their own food through
photosynthesis.
 Have cell walls.
 Do not have specialized ways to move
from place to place.
 Include:

• Euglenoids, diatoms, dinoflagellates,
green algae, red algae, brown algae.
Classification of Protists

Animal-like protists:
Have to capture other organisms for
food.
 Do not have cell walls.
 Have specialized ways to move from
place to place.
 Include:

• Amoebas, flagellates, ciliates, sporozoans
Classification of Protists

Fungus like Protists
Absorb food from their surroundings.
 Some have cell walls, some do not.
 Have specialized ways to move from
place to place.
 Include:

• plasmoidial slime molds, cellular slime
molds, water molds and downy mildew.