Bio 2- ch.28

Parasites of the genus Trypanosoma evade immune responses through what defense?

Frequently changing their surface proteins

Which of these groups includes species that produce a substance that is toxic to humans?

Dinoflagellates

Which of the following is not a group included in the protists?
-Forams
-Brown algae
-ciliates
-diatoms
-all of the above

all of the above

Which of the following is not a structure used for locomotion in protists
-all of the above
-undulating membrane
-cilia
-flagella
-pseudopedia

all of the above

Which of these groups is characterized by cells that have more than one nucleus?
-diatoms
-ciliates
-apicomplexans
-euglenids
-dinoflagellas

ciliates

The term algae refers to

several diverse groups of photosynthetic protists

What do a carnivorous dinoflagellate, a parasitic apicomplexan, and a ciliate have in common?
-all three are heterotrophic and autotrophic
-all three are photosynthetic
all three have sacs known as alveoli just beneath their plasma membranes
-all three are parasitic on other species of organisms
-all three form colonies of cells

all three have sacs known as alveoli just beneath their plasma membranes

Although controversial, chromalveolates are proposed as a clade whose common ancestor

engulfed a photosynthetic red alga in a secondary endosymbiosis event

which of the following is not a protist genera that parasitizes humans?
-plasmodium
-entamoeba
-chlamydomonas
-trichomonas
-all of the above

Chlamydomonas

why have protists been "mixed in" with plants, animals, and fungi under the hypothesis that groups eukaryotes into five supergroups?

Many protists are more closely related to plants, animals, or fungi than they are to each other and recent evidence makes it clear that the former kingdom protista was paraphyletic

The term mixotroph indicates that a protist

combines photosynthesis and heterotrophic nutrition

Which of these groups includes species that produce a substance that is toxic to humans?
-dinoflagellates
-euglenids
-diatoms
-ciliates
-apicomplexans

dinoflagellates

Which of the following is the best description of protists’ contribution to photosynthesis?
-about 30% of the worlds photosynthesis is performed by protists
-Protists carry out the majority of the worlds photosynthesis
-only terrestrial protists subbstantially contribute to photosynthesis
-the net effect of protists is to impede photosynthesis by parasitizing plants
-protists play an important role only through symbioses with photosynthetic organisms

about 30% of the worlds photosynthesis is performed by protists

Organisms are classified as Excavata based on __________.

morphological studies of the cytoskeleton

Which of the following does not take place during the process of conjugation?
-reproduction
-exchange of genetic material
-meiosis
-mitosis
-cell fusion

reproduction

Which of these groups includes parasitic unicellular organisms with a complex of organelles specialized for penetrating host cells and tissues?
-euglenoids
-apicomplexans
-dinoflagellates
-ciliates
-diatoms

apicomplexans

Which example below is a characteristic shared by diplomonads and parabasalids?
-Both lack plastids
-both are adapted to aerobic environments
-both lack mitochondria
-both have two nuclei
-both have a single flagellum

both lack plastids

Which of the following is not a cellular organelle possessed by a protist?
-mitosome
-mitochondria
-plastid
-hydrogenosome
-sporozoite

sporozoite

Which of these groups includes photosynthetic unicellular organisms with flagella and contractile vacuoles?
-diatoms
-apicomplexans
-dinoflagellates
-euglenids
-ciliates

euglenids

Although controversial, chromalveolates are proposed as a clade whose common ancestor __________.

engulfed a photosynthetic red alga in a secondary endosymbiosis

Which of the following is not a structure used for locomotion in protists?
-flagella
-cilia
-all of the above are used
-psedopedia
undulating membrane
-none of the above

all of the above

Green algae are divided into two main groups, the charophytes and the __________.

chlorophytes

Which organisms are capable of producing a "red tide"?

dinoflagellates