Biology test 2

Biology test 2 - Quiz Protists answers...

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Quiz Protists answers 1)  What makes certain red algae appear red? They possess pigments that reflect and transmit red light.  2)  If blue light is the component of the visible spectrum that can penetrate to the greatest depth in water, then what should be expected of  photosynthetic protists that survive at great depths? They should absorb blue light preferentially.  3)  According to the endosymbiotic theory of the origin of eukaryotic cells, how did mitochondria originate? from engulfed, originally free-living prokaryotes  4)  Which taxonomic group containing eukaryotic organisms is thought to be directly ancestral to the plant kingdom? green algae 5)  Which organisms represent the common ancestor of all photosynthetic plastids found in eukaryotes? cyanobacteria  6)  The following are all characteristic of the water molds (Oomycote) except a feeding plasmodium.  7)  Theoretically, which two of the following present the richest potential sources of silica? 2.    diatomaceous earth 3.    marine sediments consisting of radiolarian tests 8)  The chloroplasts of modern plants are thought to have been derived according to which sequence? cyanobacteria  --> green algae  --> green plants  9)  A snail-like, coiled, porous shell of calcium carbonate is characteristic of which group? foraminiferans 10) A mixotroph loses its plastids yet continues to survive. Which of the following most likely accounts for its continued survival? It engulfs organic material by phagocytosis. 11) In ciliates, the process that produces genetic variation through the exchange of nuclei is conjugation. 12) In life cycles with an alternation of generations, multicellular haploid forms alternate with multicellular diploid forms.  13)  Which protists form colorful, multinucleate masses? plasmodial slime molds  14)  The strongest evidence for the endosymbiotic origin of eukaryotic organelles is the similarity between extant prokaryotes and which of the  following? mitochondria and chloroplasts  15)  The goal in classifying organisms should be to create categories that reflect the evolutionary histories of organisms. What system would be best  to use? a system that uses as many kingdoms as necessary to be accurate  16)  A large seaweed that floats freely on the surface of deep bodies of water would be expected to lack which of the following? holdfasts  17)  Organisms classified as Euglenozoa have previously been classified as protozoans, protista, plants, and animals. Why the confusion? Like protozoans, they are unicellular.
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This note was uploaded on 03/31/2010 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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Biology test 2 - Quiz Protists answers...

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