Exam 25: The Origin and Diversification of Eukaryotes

Which of the following organism pairs is/are an example of secondary endosymbiosis? I.red algae-heterotrophic eukaryote II.green algae-heterotrophic eukaryote III.E.coli bacteria-photosynthetic cyanobacterium IV.Chlamydomonas and Gonium

The oldest fossil eukaryote that can be resolved taxonomically is of

Which statement is correct with regard to the comparison of secondary endosymbiosis to primary endosymbiosis?

Rhizarians that feed using threadlike pseudopodia include which of the following group(s)? I.forams II.red algae III.cercozoans IV.green algae

Some scientists who study organismal classification believe that green algae should be in an expanded "plant" kingdom called Viridiplantae.If land plants are excluded from this kingdom,then what will be true of it?

If true,which of the following is the best evidence that the cyanelles are providing nutrition (in other words,calories)to the surrounding cercozoan?

Which of the following is (are)mutualistic partnerships between a protist and a host organism? I.cellulose-digesting gut protists-wood-eating termites II.dinoflagellates-reef-building coral animals III.Trichomonas-humans IV.algae-certain foraminiferans

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

A P.bursaria cell that has lost its zoochlorellae is said to be aposymbiotic.It might be able to replenish its contingent of zoochlorellae by ingesting them without subsequently digesting them.Which of the following situations would be most favorable to the reestablishment of resident zoochlorellae,assuming that compatible Chlorella are present in P.bursaria's habitat?

Which term most accurately describes the nutritional mode of healthy P.bursaria?

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

Imagine you are investigating life in the shallow soils of a forest.In your collected samples,you observe evidence of various single-celled organisms using multiple genetic techniques as well as microscopy.If the organisms you initially assess possess mostly asymmetric or irregular forms,then this particular sample probably has many

When diatoms die,their shells fall to the floor of the ocean or lake that they inhabit and form sediments called diatomaceous earth (DE).Diatoms can be identified by their shells,and different species of diatoms prefer different water temperatures.The diatoms' porous shells are hard but often break and result in sharp edges.Crop farmers incorporate DE into their soil to help kill insect pests.When insects encounter DE,sharp shell edges cut through their exoskeletons and then softer,broken down DE absorbs insect body fluids,thereby causing the insects to die due to dehydration.Why might farmers who raise large livestock also use DE in the animals' feed?

Please use the following information to answer the questions below. Diatoms are encased in valves made of translucent hydrated silica whose thickness can vary.The material used to store excess calories can also vary.At certain times,diatoms store excess calories in the form of the liquid polysaccharide laminarin and at other times as oil.The table shows data concerning the density (specific gravity)of various components of diatoms and of their environment. -Judging from the table and given that water's density and,consequently,its buoyancy decreases at warmer temperatures,in which environment would diatoms (and other suspended particles)sink most slowly?

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?

Which of these observations gives the most support to the endosymbiotic theory for the origin of eukaryotic cells?

The best evidence for not classifying the slime molds as fungi comes from slime molds'

Why is there controversy surrounding the eukaryotic tree?

According to the endosymbiotic theory of the origin of eukaryotic cells,how did mitochondria originate?

A large seaweed that floats freely on the surface of deep bodies of water would be expected to lack which of the following?