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detailed questions exam 1 spring 09

detailed questions exam 1 spring 09 - Symbioses are...

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E D C B A ence of phage-resistant cells. Each row represents a new generation derived from the corresponding parent culture. Spheres colored blue indicate that the All nitrogen that supports life comes from Earth’s atmosphere (N 2 ). Dinitrogen is stable due to the energy necessary to break the nitrogen-nitrogen triple bond. Prokaryotes carry out unique and important steps in the nitrogen cycle. The steps in the nitrogen cycle that are performed by microbes are marked with a circle-containing microbes and letter. With this information answer the following questions.
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In lecture, a spectrum of associations between microbes and their plant and animal hosts were presented. These associations, or symbioses, range from beneficial to damaging.
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Unformatted text preview: Symbioses are important when considering biological phenomenon because practically no organism lives in isolation. Some eukaryotes occupy the extreme environments of deep ocean vents, including the tube worm shown above. Remarkably, bacteria make up half of the worm’s body weight. Answer the following questions related to this unique symbiosis. The above panel of Figures (a, b, c, d) shows a series of experiments conducted with Streptococcus pneumoniae by Frederick Griffith. Results from these and subsequent experiments identifying the “transforming material” were the beginnings of molecular genetics. Answer the following questions pertaining to these experiments....
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