Chapter 28: Protists


1 .       In general, how do algae and protozoans differ? (Concept 28.1E-Book) [Hint]

 Protozoans can move and algae cannot.
 Algae are free-living, and protozoans are parasitic.
 Protozoans are autotrophic, and algae are heterotrophic.
 Algae are photosynthetic, and almost all protozoans are heterotrophic.
 Algae are prokaryotes, and protozoans are eukaryotes.

2 .       _____ are eukaryotic autotrophs that float near the surface of water and are the basis of the food chain. (Concept 28.1E-Book) [Hint]

 Slime molds

3 .       Which of the following are two clades that are adapted to anaerobic conditions and contain mitochondria that lack DNA? (Concept 28.2E-Book) [Hint]

 dinoflagellates and diatoms
 chrysophytes and radiolarians
 bacillariophytes and forams
 gymnamoebas and slime molds
 diplomonads and parabasalids

4 .       How does Euglena obtain energy? (Concept 28.3E-Book) [Hint]

 It obtains energy through photosynthesis. It is an autotroph.
 It absorbs nutrients from the environment. It is a heterotroph.
 It engulfs prey by phagocytosis.
 It is a chemoautotroph.
 The first three answers are correct.

5 .       A sign on the beach states, "Beach Closed. Red Tide." The organisms interfering with your use of this beach are _____. (Concept 28.4E-Book) [Hint]

 species of red algae

6 .       Groups of seaweeds can generally be distinguished on the basis of _____. (Concept 28.5E-Book) [Hint]

 whether they are multicellular or unicellular
 whether they have true leaves, stems, and roots
 whether they are autotrophic or heterotrophic

7 .       Alternation of generations is seen in the life cycle of the _____. (Concept 28.5E-Book) [Hint]


8 .       How are the amoebas in the clade Cercozoa distinguished from amoebas in other clades? (Concept 28.6E-Book) [Hint]

 They feed by means of extensions that may bulge from virtually anywhere on the cell surface.
 Their pseudopodia are thread-like.
 Their shells are made of cellulose.
 Their pseudopodia are lobe-shaped.
 They are parasites of vertebrates as well as some invertebrates.

9 .       Which of the following is not a correct statement about slime molds? (Concept 28.7E-Book) [Hint]

 Cellular slime molds have diploid zygotes.
 Plasmodial slime molds have fruiting bodies that function in sexual reproduction.
 In plasmodial slime molds, the haploid condition is the dominant part of the life cycle.
 Cellular slime molds form masses when food is scarce, but their cells remain separated.
 Cellular slime molds do not have a flagellated stage.

10 .       Which of the following organisms are incorrectly paired with their description? (Concept 28.8E-Book) [Hint]

 dinoflagellates: phytoplankton with whirling, spinning movements
 golden algae: yellow and brown carotene and xanthophyll; biflagellated plankton
 diatoms: two-piece shells of silica
 multicellular brown algae: commonly known as seaweeds
 red algae: cause red tides

©2005 Pearson Education, Inc., publishing as Benjamin Cummings