Page 4 - Kingdom Protist
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Introduction to Protists PART 1
Protist
Objectives Protists are classified more easily by what they
are not than by what they are. Protists are not
Explain how protists are animals, plants, or fungi because they do not have
classified.
all of the characteristics necessary to place them in
Describe how some any of these kingdoms. The Kingdom Protista was
protists with mitochondria
created to include this diverse group of more than
might have evolved.
200,000 organisms.
Explain why the All protists share one important trait—they are
organization of Kingdom eukaryotes. You learned in Chapter 7 that
Protista might change.
eukaryotic cells contain membrane-bound
organelles. Like all eukaryotes, the DNA of protists
is found within the
membrane-bound nucleus. Although protists have
Review Vocabulary
a cellular structure similar to other eukaryotes,
Heterotroph: organism
that cannot make its there are remarkable differences in their
own food and must get reproductive methods. Some reproduce asexually
its energy and nutrients by mitosis while others exchange genetic material
from other organisms during meiosis.
Classifying protists Because they are such a
diverse group of organisms, some scientists classify
protists by their method of obtaining nutrition.
Protists are divided into three groups using this
method: animal-like protists, plant like
protists, and fungus like protists. The protozoan
(proh tuh ZOH un) (plural, protozoa or protozoans),
shown in Figure 1.1, is an example of an animal-like
protist because it is a heterotroph it ingests food.
Additional examples of protists and a summary of
characteristics are shown in Table 1.1.
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