test bank chap 14
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Functional traits can be shared between organisms with divergent SSU rRNA sequences because A) functional traits may be lost by different lineages over time. B) functional traits may evolve independently in different lineages over time. C) horizontal gene transfer can result in the transfer of genes between divergent lineages. D) functional traits may evolve independently, be shared through horizontal gene transfer, or be lost in divergent lineages | D) functional traits may evolve independently, be shared through horizontal gene transfer, or be lost in divergent lineages |
3) What form of photosynthesis evolved first on Earth? A) oxygenic B) anoxygenic C) autotrophic D) heterotrophic | B) anoxygenic |
The only group of oxygenic phototrophic bacteria are the A) green nonsulfur bacteria. B) Chloroflexi. C) Cyanobacteria. D) Chlorobi. | C) Cyanobacteria. |
All microbial phototrophs A) fix carbon dioxide. B) use water as an electron donor for photosynthesis. C) fix carbon dioxide and use water as an electron donor for photosynthesis. D) use light energy to drive electron transport to generate energy. | D) use light energy to drive electron transport to generate energy. |
Anoxygenic phototrophs A) may use a variety of electron donors for photosynthesis. B) are an ancient monophyletic group of bacteria. C) can be either autotrophic or heterotrophic. D) can be either autotrophic or heterotrophic and may use a variety of electron donors for photosynthesis. | D) can be either autotrophic or heterotrophic and may use a variety of electron donors for photosynthesis. |
Nitrogen fixation is A) rare among microorganisms. B) widespread among microorganisms. C) limited to Proteobacteria. D) common in Bacteria, but absent in Archaea. | B) widespread among microorganisms. |
Green sulfur bacteria are often found at the greatest depths of all phototrophic cells in lakes, oceans, and microbial mats. This is because green sulfur bacteria A) are very sensitive to UV irradiation, despite their reliance on light for energy. B) are the only phototrophs that can use hydrogen sulfide as an electron donor for photosynthesis. C) are strict anaerobes. D) have chlorosomes that are very efficient at harvesting light, allowing them to perform photosynthesis where light intensities are very low. | D) have chlorosomes that are very efficient at harvesting light, allowing them to perform photosynthesis where light intensities are very low. |
Diazotrophs maximize nitrogenase activity by A) closely coupling N2 fixation with high rates of photosynthesis. B) fixing N2 at times when oxygen is absent or in low concentrations. C) producing specialized structures to protect nitrogenase from oxygen. D) producing specialized structures or fixing N2 at times when oxygen is absent to protect nitrogenase from oxygen. | D) producing specialized structures or fixing N2 at times when oxygen is absent to protect nitrogenase from oxygen. |
Which of the following traits do ammonia and nitrite oxidizers share? A) chemoorganotrophic B) autotrophic C) aerobic D) autotrophic and aerobic | D) autotrophic and aerobic |
Dissimilative iron-reducing bacteria couple the A) reduction of ferric iron or manganese to the oxidation of sulfur. B) reduction of ferric iron or manganese to the fermentation of sugars. C) oxidation of H2 or organic compounds to the reduction of ferric iron or manganese. D) reduction of ferric iron to photosynthesis. | C) oxidation of H2 or organic compounds to the reduction of ferric iron or manganese. |
Carboxydotrophic bacteria oxidize carbon monoxide to A) carbon dioxide. B) methane. C) acetate. D) glucose. | A) carbon dioxide. |
What is the difference between a methylotroph and methanotroph? A) Methylotrophs are strict anaerobes, while methanotrophs are strict aerobes. B) Methylotrophs use organic carbon lacking C-C bonds as electron donors and carbon sources, while methanotrophs exclusively use methane as an electron donor and carbon source. C) Methylotrophs produce organic carbon lacking C-C bonds, while methanotrophs exclusively produce methane. D) Methylotrophs are in Proteobacteria, while methanotrophs are in Archaea. | B) Methylotrophs use organic carbon lacking C-C bonds as electron donors and carbon sources, while methanotrophs exclusively use methane as an electron donor and carbon source. |
Bioluminescence develops when A) population density is high. B) oxygen is depleted. C) ambient light is low. D) the host induces the bioluminescence genes. | A) population density is high. |
Bioluminescence is catalyzed by luciferase, which creates light by A) shunting electrons from FMNH2 to O2, which releases energy in the form of light. B) reversing photosynthesis. C) hydrolyzing ATP. D) reducing LuxR. | A) shunting electrons from FMNH2 to O2, which releases energy in the form of light. |
Bioluminescent microorganisms are found in which of the following groups? A) Firmicutes B) Thaumarchaeota C) Gammaproteobacteria D) Verrucomicrobia | C) Gammaproteobacteria |