bio 2- chapter 28

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

ciliate- large macronucleus and several tiny micronuclei


-large -protist -use cilia to move and feed

The holdfast of brown algae functions in

anchoring the algae so no locomotion

brown algae

-largest and most complex multicellular algae -along temperate coast with cold water currents

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

Phytophthora infestans, resistant to pesticides

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

charophytes and the chlorophytes


red alge -most abundant large algae in the warm costal waters of tropical oceans


-euglenozoans -large single mitochondrion -organzed mass of dna called a kinetoplast

The term mixotroph indicates that a protist

combines photosynthesis and heterotrophic nutrition

Which of the following is not a protist genera that parasitizes humans?

chlamydomonas -dosent parasitize humans

which organisms produce red tide


Which of the following is not a structure used for locomotion in protists?

All of the listed structures are used for locomotion in protists. Pseudopodia Undulating membrane Flagella Cilia

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

Diatoms Forams Ciliates brown algae -all members of SAR clade- includes important photosynthetic organism and human pathogens

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

All three have sacs known as alveoli just beneath their plasma membranes.

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


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

Frequently changing their surface proteins -internal parasites -infect humans and cause sleeping sickness(neurological disease that is fatal)

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

sporozoite protist have mitosome hydrogenosome mitochondria plastid

Apicomplexans are currently assigned to the chromalveolates because

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

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.

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

a cellular slime mold is multi cellular

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

both lack plastids

Protists are best described as which of the following?

Eukaryotes that are not plants, animals, or fungi – dont comprise a domain

Which protist group is thought to be most closely related to animals?


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


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

euglenids has long -tinseled flagellum -contractile vacuole -chloroplasts

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?

diatoms walls consist of hydrated silica embedded in an organic matrix

Which of the following does not take place during the process of conjugation?

Reproduction -does occur -cell fusion -meiosis -exchange of genetic material -mitosis

organisms are classified as excavata based on

morphological studies of the cytoskeleton

the term algae refers to

several diverse groups of photosynthetic protist

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


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

engulfed a photosynthetic red alga in a secondary endosymbiosis event

Which protists were once categorized as fungi due to their multinucleate filaments that resemble hyphae?


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.

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