<img src="https://d5nxst8fruw4z.cloudfront.net/atrk.gif?account=iA1Pi1a8Dy00ym" style="display:none" height="1" width="1" alt="" />
Dismiss
Skip Navigation

6.3: Animal-like Protists

Difficulty Level: At Grade Created by: CK-12
Atoms Practice
Estimated2 minsto complete
%
Progress
Practice Animal-like Protists
 
 
 
MEMORY METER
This indicates how strong in your memory this concept is
Practice
Progress
Estimated2 minsto complete
%
Estimated2 minsto complete
%
Practice Now
MEMORY METER
This indicates how strong in your memory this concept is
Turn In

What can hunt prey and move, but is not an animal?

Some protists, like these Paramecium, act much like animals. Notice the tiny hair-like cilia that help them move. The food vacuoles, where they digest their prey, are colored in orange.

Animal-like Protists

Animal-like protists are called protozoa. Protozoa are single-celled eukaryotes that share some traits with animals. Like animals, they can move, and they are heterotrophs. That means they eat things outside of themselves instead of producing their own food.

Animal-like protists are very small, measuring only about 0.01–0.5mm. Animal-like protists include the flagellates, ciliates, and the sporozoans.

Different Kinds of Animal-like Protists

There are many different types of animal-like protists. They are different because they move in different ways.

  • Flagellates have long flagella, or tails. Flagella rotate in a propeller-like fashion, pushing the protist through its environment (Figure below). An example of a flagellate is Trypanosoma, which causes African sleeping sickness.
  • Other protists have what are called transient pseudopodia, which are like temporary feet. The cell surface extends out to form feet-like structures that propel the cell forward. An example of a protist with pseudopodia is the amoeba.
  • The ciliates are protists that move by using cilia. Cilia are thin, very small tail-like projections that extend outward from the cell body. Cilia beat back and forth, moving the protist along. Paramecium has cilia that propel it.
  • The sporozoans are protists that produce spores, such as the toxoplasma. These protists do not move at all. The spores develop into new protists.

These flagellates all cause diseases in humans.

A video of the animal-like amoeba can be viewed at: http://commons.wikimedia.org/wiki/File:Amoeba_engulfing_diatom.ogg.

Vocabulary

  • cilia: Very small tail-like projections that beat back and forth to allow movement.
  • ciliate: Type of protozoa, such as Paramecium, that moves with cilia.
  • flagellate: Type of protozoa, such as Giardia, that moves with flagella.
  • heterotroph: Organism that must eat food to obtain energy.
  • protozoa: Single-celled eukaryotes that share many traits with animals.
  • pseudopodia: Temporary feet where the cell surface extends out.
  • sporozoa (singular, sporozoan): Type of protozoa that cannot move as adults.

Summary

  • Protozoa are single-celled eukaryotes that share some traits with animals.
  • Protozoa can move by flagella, cilia, or pseudopodia, or they may not move at all.

Practice

Use the resource below to answer the questions that follow.

  1. What are the characteristics of Sarcomastigophora? Where can they be found?
  2. What are the characteristics of Sporozoa? Where can they be found?
  3. What are the characteristics of Cnidospora? Where can they be found?
  4. What are the characteristics of Ciliophora? Where can they be found?

Review

  1. What features describe the protozoa?
  2. How can animal-like protists move?

    Notes/Highlights Having trouble? Report an issue.

    Color Highlighted Text Notes
    Please to create your own Highlights / Notes
    Show More

    Vocabulary

    cilia

    Very small tail-like projections that beat back and forth to allow movement.

    ciliate

    Type of protozoa, such as Paramecium, that moves with cilia.

    flagellate

    Type of protozoa, such as Giardia, that moves with flagella.

    heterotroph

    Organism that must eat food to obtain energy.

    protozoa

    Single-celled eukaryotes that share many traits with animals.

    pseudopodia

    Temporary feet where the cell surface extends out.

    sporozoa

    (singular, sporozoan): Type of protozoa that cannot move as adults.

    Image Attributions

    Show Hide Details
    Description
    Difficulty Level:
    At Grade
    Grades:
    7 , 8
    Date Created:
    Nov 29, 2012
    Last Modified:
    Aug 30, 2016
    Files can only be attached to the latest version of Modality
    Please wait...
    Please wait...
    Image Detail
    Sizes: Medium | Original
     
    SCI.LSC.622.2.L.1
    Here
    Add Note
    Please to create your own Highlights / Notes