Chapter 28 – Study Module – Flashcards
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Which of the following does not take place during the process of conjugation?
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Reproduction.
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Which of the following is a structure used for locomotion in protists?
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Pseudopodia, Cilia, Flagella, Undulating membrane.
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Apicomplexans are currently assigned to the chromalveolates because __________.
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the apicoplast, a modified plastid, appears to be of red algal origin.
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Which of the following is not a protist genera that parasitizes humans?
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Chlamydomonas.
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Which of these groups includes unicellular organisms that, due to the structure of their cell walls, can withstand pressures equal to the pressure under each leg of a table supporting an elephant?
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Diatoms.
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Which of these groups includes photosynthetic unicellular organisms with flagella and contractile vacuoles?
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Euglenids.
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Which of these groups is characterised by cells that have more than one nucleus?
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Ciliates.
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What is one way in which a cellular slime mold differs from a plasmodial slime mold?
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A cellular slime mold is multicellular.
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Which of these groups includes species that produce a substance that is toxic to humans?
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Dinoflagellates.
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Which of the following is not a cellular organelle possessed by a protist?
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Sporozoite.
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Which protist group is thought to be most closely related to animals?
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Choanoflagellates.
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Why have protists been "mixed in" with plants, animals, and fungi under the hypothesis that groups eukaryotes into five supergroups?
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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.
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Which organisms are capable of producing a "red tide"?
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Dinoflagellates
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Parasites of the genus Trypanosoma evade immune responses through what defense?
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Frequently changing their surface proteins.
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Molecular data suggest that plastids originated as __________ engulfed by a heterotrophic eukaryote.
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cyanobacteria
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Protists are best described as which of the following?
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Eukaryotes that are not plants, animals or fungi.
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Organisms are classified as Excavata based on __________.
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morphological studies of the cytoskeleton.
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Which of the following is one of the main weaknesses of the proposed classification scheme in which all eukaryotes are divided into five supergroups?
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It shows all five supergroups diverging simultaneously from a common ancestor.
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Which of the following is a group included in the protists?
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Diatoms, Brown Algae, Forams, Ciliates.
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Although controversial, chromalveolates are proposed as a clade whose common ancestor __________.
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engulfed a photosynthetic red alga in a secondary endosymbiosis event.
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Green algae are divided into two main groups, the charophytes and the __________.
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chlorophytes.
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The term mixotroph indicates that a protist __________.
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combines photosynthesis and heterotrophic nutrition.
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The holdfast of brown algae functions in __________.
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anchoring the algae.
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__________ is a protist that causes late blight of potatoes and was responsible for the Irish potato famine of the 19th century.
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Phytophthora infestans.
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Which example below is a characteristic shared by diplomonads and parabasalids?
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Both lack plastids.
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The term algae refers to __________.
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several diverse groups of photosynthetic protists.
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Which of these groups includes parasitic unicellular organisms with a complex of organelles specialized for penetrating host cells and tissues?
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Apicomplexans.
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Which of the following is the best description of protists' contribution to photosynthesis?
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About 30% of the world's photosynthesis is performed by protists.
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Which protists were once categorized as fungi due to their multinucleate filaments that resemble hyphae?
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Oomycetes
