Exam 28: Protists

A P.bursaria cell that has lost its zoochlorellae is aposymbiotic.If aposymbiotic cells have population growth rates the same as those of healthy,zoochlorella-containing P.bursaria in well-lit environments with plenty of prey items,then such an observation would be consistent with which type of relationship?

The following questions refer to the description below. Malaria is a global health problem in over 100 countries,killing about one million people every year.The protist,Plasmodium,that causes malaria lives in 2 hosts,mosquitoes and humans.Malaria is transmitted to humans by the Anopholes mosquito. -A friend of yours has just returned from central Africa and has told you that she is sick with malaria.You know your friend took an anti-malaria medication before she left on her trip.How can you explain why your friend contracted malaria?

If true,which of the following would be most important in determining whether P.chromatophora's cyanelle is still an endosymbiont,or is an organelle,as the term cyanelle implies?

Which protists are in the same eukaryotic supergroup as land plants?

Living diatoms contain brownish plastids.If global warming causes blooms of diatoms in the surface waters of Earth's oceans,how might this be harmful to the animals that build coral reefs?

Which of the following groups is matched with a correct anatomical feature?

Which group is incorrectly paired with its description?

A biologist discovers an alga that is marine,multicellular,and lives at a depth reached only by blue light.This alga probably belongs to which group?

Unikonta is a supergroup that includes all of the following except ________.

The next few questions refer to the following description and table. Diatoms are encased in Petri-platelike cases (valves)made of translucent hydrated silica whose thickness can be varied.The material used to store excess calories can also be varied.At certain times,diatoms store excess calories in the form of the liquid polysaccharide,laminarin,and at other times as oil.The following are data concerning the density (specific gravity)of various components of diatoms,and of their environment. Specific Gravities of Materials Relevant to Diatoms -Using dead diatoms to "pump" CO₂ to the seafloor is feasible only if dead diatoms sink quickly.Consequently,application of mineral fertilizers,such as iron,should be most effective at times when diatom valves

Which process results in genetic recombination,but is separate from the process by which the population size of Paramecium increases?

If the mitosomes of Giardia contain no DNA,yet are descendants of what were once free-living organisms,then where are we likely to find the genes that encode their structures,and what accounts for their current location there?

Unlike most excavates,Giardia trophozoites have no oral groove and are unable to form food vacuoles.Thus,we should expect its nutrition (mostly glucose)to come from

The chloroplasts of land plants are thought to have been derived according to which evolutionary sequence?

Which term best describes the symbiotic relationship of well-fed P.bursaria to their zoochlorellae?

Diatoms are mostly asexual members of the phytoplankton.Diatoms lack any organelles that might have the 9 + 2 pattern.They obtain their nutrition from functional chloroplasts,and each diatom is encased within two porous,glasslike valves.Which question would be most important for one interested in the day-to-day survival of individual diatoms?

Which of the following statements about dinoflagellates is true?

The following questions refer to the description below. Malaria is a global health problem in over 100 countries,killing about one million people every year.The protist,Plasmodium,that causes malaria lives in 2 hosts,mosquitoes and humans.Malaria is transmitted to humans by the Anopholes mosquito. -The use of DDT greatly decreased numbers of Anopholes mosquitoes in the 1960s,and drugs killed the Plasmodium.Now doctors tend to prescribe a combination of drugs against malaria.Why don't doctors prescribe a vaccine to combat malaria?

Given its mode of reproduction and internal structures,which of the following should be expected to occur in Giardia at some stage of its life cycle? 1)separation (segregation)of daughter chromosomes 2)crossing over 3)meiosis

The motility that permits P.bursaria to move toward a light source is provided by