Chapter 28 homework questions

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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?

It shows all five supergroups diverging simultaneously from a common ancestor

_______is a protist that causes late blight of potatoes and was responsible for the Irish potato famine of the 19th century

Phytophtora infestans

Which Protista were once categorized as fungi due to their multi nuclear filaments that resemble hyphae?

Oomycetes

Protists are best described as which of the following?

Eukaryotes that are not plants, animals, or fungi

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

Engulfed a photosynthetic red alga in a secondarh endosymbiosis event

The holdfast of brown algae functions in________.

Anchoring algae

Which protist group is thought to be most clearly related to animals

Choanoflagellates

Which of the following is NOT a structure used for locomotion? Peusodpodia, cilia, flagella, undulating membrane

All of the above

Which of the following is not a group included in protists—

All of the above

Which of the following is not a cellular organelle possessed by a protist?

Sporozoite

The term algae refers to ________.

Several diverse groups of photosynthetic protists.

Organisms are classified as Excavata based on_______

Morphological studies of the cytoskeleton

Which of these groups includes photosynthetic unicellular organisms with flagella and contractile vacuoles?

Euglenids

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

Dinoflagellates

Which of the following does NOT take place during the process of conjugation?
Meiosis
Mitosis
Cell fusion
Exchange of genetic material
Reproduction

Reproduction

Which of the following is the best description of protists’ contribution to photosynthesis?

About 30% of the world’s photosynthesis is performed by protists.

Which of the following is not a protist genera that parasitizes humans?
Trichimonas
Entamoaeba
Chlamydomonas
Plasmodium

Chlamydomonas

Which of these groups includes parasitic unicellular organisms with a complex of organelles specialized for penetrating host cells and tissues?

Apicomplexans

The term mixotroph indicates that a protist_______

Combines photosynthesis and heterotrophic nutrition.

Which example below is a characteristic shared by diplomonads and parabasalids?

Both lack plastids

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

Frequentlu changing their surface proteins

What is one way in which cellular slime mold differs from a plasmodial slime mold?

A cellular slime mold is multicellular

Molecular data suggest that plastids originated as ________ engulfed by a heterotrophic eukaryote

Cyanobacteria

Which organisms are capable of producing a "red tide"?
Dinoflagellates
Euglenids
Chrysophytes
Sporozoans

Dinoflagellates

Which of these groups is characterized by cells that have more than one nucleus?

Ciliate

What do carnivorous dinoflagellates, a parasitic apicomplexan, and a ciliate have in common?

All Three have sacs known as alveoli just beneath their plasma membranes

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

Chlorophytes

Apicomplexans are currently assigned to the chromalveolates because_______

The apicoplast, a modified plastid, appears to be of red algal origin.

Which of these 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?

Diatoms- wall consists of hydrated silica embedded in an organic matrix

Protists are best described as….

Eukaryotes that are not plants, animals, or fungi

The cells of _____ and _____ have modified mitochondria.

Diplomonads and parabasilids

The members of _____ are characterized by cells with small membrane-bounded cavities under their cell membranes

Alveolata

Golden algae, brown algae, red algae, chlorophytes, and charophyceans are some examples of protists that are _____

Photosynthetic

Which of these groups consist of parasitic flagellated cells, such as Trypanosoma, the organism that causes sleeping sickness?
Kinetoplastids
Diatoms
Brown algae

Kinetoplastids

Which three groups contain large algae known as seaweeds?

Brown algae, red algae, and green algae

Stramenopiles include all of the following except….

Golden algae
Cellular slime molds
Brown algae
Diatoms
Water molds

Cellular slime molds

What is characterized by glasslike walls containing silica?

Diatoms

Plasmodium, the parasitic organism that causes malaria, is a_____.
Entamoeba
Diatom
Apiocomplexan
Ciliate

Apiocomplexan

A paramecium is a(n)
Metazoan
Ciliate
Apiocomplexan
Dinoflagellates

Ciliate

All organisms classified as _____ move and feed using cilia

Ciliates

Which group is characterized by cells with hairlike projections on their flagella?
Alveolata
Metazoa
Euglenozoa
Rhodophyta
Stramenopila

Stramenopila

Which of these algal groups possess a photosynthetic pigment that allows them to live in deep water?

Red algae

A group that includes both aquatic decomposers and the parasites responsible for late potato blight?

Oomycetes

Which term describes fusion of two gametes to form a diploid zygote?
Syngamy
Meiosis
Mitosis

Syngamy

Which term describes the multicellular haploid form of a protist that shows alternation of generations?
Sporophyte
Spore
Gametophyte
Zygote

Gametophyte

Which structure mediates the attachment of spores to a surface on which to grow?

Holdfast

Haploids are produced by….

Meiosis of diploid cells

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