Biology

Eldra Solomon, Linda Berg, Diana W. Martin

Chapter 24

Protists - all with Video Answers

Educators

Chapter Questions

Problem 1

Which of the following is not true of the protists? (a) they are unicellular, colonial, coenocytic, or simple multicellular organisms (b) their cilia and flagella have a $9+2$ arrangement of microtubules (c) they are prokaryotic, like the eubacteria and archaebacteria (d) some are free-living, and some are endosymbionts
(e) most are aquatic and live in the ocean or in freshwater ponds

Ramesh Singh

Ramesh Singh

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Problem 2

Amoebas move and obtain food by means of (a) pseudopodia
(b) flagella (c) cilia (d) gametangia (e) trichocysts

Ramesh Singh

Numerade Educator

Problem 3

Foraminiferans (a) are endosymbionts in many marine invertebrates (b) were responsible for the Irish potato famine in the 19th century (c) secrete many-chambered tests with pores through which cytoplasmic extensions project (d) have numerous trichocysts that may aid in trapping and holding prey
(e) contain phycocyanin and phycoerythrin, pigments found in no other protist group

Ramesh Singh

Numerade Educator

Problem 4

Unicellular protists that are free-living or parasitic, move by means of flagella, and do not photosynthesize are called
(a) euglenoids (b) dinoflagellates (c) myxamoebas
(d) zooflagellates (e) apicomplexans

Ramesh Singh

Numerade Educator

Problem 5

Paramecium and other ciliates often display a sexual phenomenon called (a) oogamy (b) conjugation (c) anisogamy (d) red tide
(e) alternation of generations

Ramesh Singh

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Problem 6

Parasitic alveolates that form spores at some stage in their life belong to which group? (a) actinopods (b) ciliates (c) coccolithophorids (d) apicomplexans (e) dinoflagellates

Danielle Ashley

Danielle Ashley

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Problem 7

Malaria (a) is transmitted by the bite of a female tsetse fly (b) is caused by a parasitic zooflagellate, Giardia intestinalis (c) is a serious form of amoebic dysentery caused by Entamoeba histolytica (d) is caused by an apicomplexan that spends part of its life cycle in the Anopheles mosquito and part in humans (e) is transmitted when people drink water tainted by a red tide

Ramesh Singh

Numerade Educator

Problem 8

Alveolates characterized by two flagella, one wrapped around the center of the cell like a belt and the other projecting behind the cell, are (a) actinopods (b) ciliates (c) coccolithophorids
(d) apicomplexans (e) dinoflagellates

Ramesh Singh

Numerade Educator

Problem 9

Photosynthetic protists with shells composed of two halves that fit together like a petri dish are (a) golden algae (b) diatoms (c) euglenoids (d) brown algae
(e) foraminiferans

Ramesh Singh

Numerade Educator

Problem 10

Chlorophyll $a$, chlorophyll $b$, and carotenoids are found in (a) green algae, red algae, and land plants (b) green algae, euglenoids, and land plants (c) brown algae, green algae, and golden algae (d) brown algae, diatoms, and golden algae (e) green algae, euglenoids, and diatoms

Ramesh Singh

Numerade Educator

Problem 11

Which protists have photosynthetic pigments similar to those of the cyanobacteria?
(a) golden algae (b) diatoms
(c) euglenoids
(d) brown algae (e) red algae

Ramesh Singh

Numerade Educator

Problem 12

The multicellular bodies of ________________ are differentiated into blades, stipes, holdfasts, and gas-filled floats. (a) golden algae (b) diatoms (c) euglenoids (d) kelps
(e) green algae

Ramesh Singh

Numerade Educator

Problem 13

The feeding stage of plasmodial slime molds is a multinucleate
(a) plasmodium
(b) pseudoplasmodium
(c) pseudopodium
(d) gametangium
(e) mycelium

Ramesh Singh

Numerade Educator

Problem 14

Cellular slime molds (a) include Physarum and Phytophthora
(b) are more closely related to prokaryotes than are any other protists (c) are responsible for late blight of potatoes, which led to starvation in Ireland in the $1840 \mathrm{s}$ (d) have isogamous sexual reproduction (e) form a pseudoplasmodium when cells aggregate in response to cyclic AMP

Ramesh Singh

Numerade Educator

Problem 15

Water molds reproduce asexually by forming _______________, and sexually by forming _______________. (a) oospores; holdfasts (b) zoospores; zooxanthellae (c) zoospores; oospores (d) holdfasts; isogametes (e) oospores; isogametes

Ramesh Singh

Numerade Educator

Problem 16

Label the diagrams. Use Figures $24-7 \mathrm{b}$ and $24-6 \mathrm{b}$ to check your
answers.

Ritika Shakkerwal

Ritika Shakkerwal

Numerade Educator