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F09_BIOL1010_B_midtermKey

E more than one of the above statements is true 19

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Unformatted text preview: tion of DNA? A. Histone proteins help organize DNA in a compact form in eukaryotes, but not in bacteria. B. Histone proteins help organize DNA in a compact form in bacteria, but not in eukaryotes. C. In both bacteria and eukaryotes, supercoiling of DNA by the DNA gyrase enzyme is the major method of making DNA compact. D. DNA is present as one or more chromosomes in eukaryotes; bacteria only have DNA as plasmids. 18. Considering metabolism, which of the following statements in A through D is/are true? A. Many reactions will be oxidation ­reduction (redox) reactions. B. Reactions in both cellular respiration and photosynthesis require the direct absorption of light photons to occur. C. Individual organisms carry out photosynthesis or cellular respiration, but not both. D. Metabolic reactions occur in eukaryotes, but not in bacteria. E. More than one of the above statements is true. 19. Which of the following is true of photosynthesis? A. B. C. D. It always yields O2 as a product. It always requires pigment molecules and light. It could not occur until the atmosphere became oxygenated, approximately 2.7 billion years ago. It occurs in eukaryotes, but not prokaryotes. 20. You are given electron micrographs (pictures taken with a microscope) showing translation within an unknown cell. Which of the following would provide you with enough information to confirm that this process is taking place in a prokaryote [Versions A, C]/...
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