BIOChapter27

BIOChapter27 - CH27TESTMF Question 1 1 points In a...

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CH27TESTMF Question 1 1 points Save In a hypothetical situation, the genes for sex pilus construction and for tetracycline resistance are located together on the same plasmid within a particular bacterium. If this bacterium performs conjugation involving a copy of this plasmid, then the result should be a transformed bacterium. the rapid spread of tetracycline resistance to other bacteria in that habitat. the subsequent loss of tetracycline resistance in this bacterium. the production of endospores among the bacterium's progeny. the temporary possession by this bacterium of a completely diploid genome. Question 2 1 points Save In a practice known as crop rotation , farmers alternate a crop of legumes (plants whose roots bear nodules containing Rhizobium ) with a crop of nonlegumes. What is the benefit of this practice? Rhizobium fixes nitrogen, and the fixed nitrogen will fertilize the soil. It prevents the farmer from being exposed to the same crop pathogens year after year. It keeps the plants from becoming tolerant of the bacteria in a particular variety of soil. It keeps the plants from becoming pesticide resistant. It keeps those bacteria that are plant pathogens from becoming pesticide resistant. Question 3 1 points Save Mycoplasmas are bacteria that lack cell walls. On the basis of this structural feature, which of the statements below is true about mycoplasmas? They are gram-negative. They are subject to lysis in hypotonic conditions. They lack a cell membrane as well. They undergo ready fossilization in sedimentary rock. They possess typical prokaryotic flagella.
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Question 4 1 points Save About half of all prokaryotes are capable of directional movement. The following statements are all true of such directional movement except that it may occur via flagellar action. it should not occur among the archaea. internal helical filaments with basal motors can drive this movement. it should occur in response to negative phototaxis in photosynthetic prokaryotes. it may occur via gliding along a thread of "slime" secreted by filamentous forms. Question 5 1 points Save What is the primary ecological role of prokaryotes? parasitizing eukaryotes, thus causing diseases breaking down organic matter metabolizing materials in extreme environments adding methane to the atmosphere serving as primary producers in terrestrial environments Question 6 1 points Save Many physicians administer antibiotics to patients at the
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BIOChapter27 - CH27TESTMF Question 1 1 points In a...

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