Which of these groups is characterized by cells that have more than one nucleus? |
ciliate- large macronucleus and several tiny micronuclei |
cilate |
-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 |
rhodophytes |
red alge -most abundant large algae in the warm costal waters of tropical oceans |
kinetoplastids |
-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 |
dinoflagellates |
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? |
dinoflagellates |
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? |
Choanoflagellates |
Molecular data suggest that plastids originated as __________ engulfed by a heterotrophic eukaryote. |
cyanobacteria |
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? |
apicomplexans |
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? |
Oomycetes |
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. |