Section 1

Characteristics of Protists

• Protists are unicellular or simple multicellular eukaryotic organisms that are not plants, fungi, or animals. Protists are classified by the characteristics that make them funguslike, plantlike, or animal-like.

• Evidence suggests that the first protists arose from endosymbiotic prokaryotes.

Vocabulary protist (p. 501)

binary fission (p. 504)

• Many protists are autotrophs. Other protists are heterotrophs. Protists use flagella, cilia, or pseudopodia for locomotion.

• Protists reproduce either asexually, sexually, or both. They reproduce asexually by binary fission or multiple fission. They often reproduce sexually by conjugation.

multiple fission (p. 504)

conjugation (p. 504)

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