Solutions to 100 passage-based Biology questions

It is also possible slightly that two mutants arose

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Unformatted text preview: ply not designed to isolate such a mutant. It is also possible (slightly) that two mutants arose in the same cell with the same dose of radiation in Experiment 2. 31. D. The original suspension of bacteria contained normal cells that can grow on a minimal medium. Regardless of how many cells mutated, there would be innumerable cells still able to grow on this medium (cells that gave rise to Colony a and Colony B should also be able to grow on a ampicillin-free medium!). 32. D. Basic knowledge of how bacteria can transfer genetic material is required. Only transference is not a genetic transfer mechanism in bacteria. 33. C. Answer C is a false statement as antibiotics do not increase the mutation rate of bacteria. Resistance is a phenomenon of selection, with resistant bacteria surviving the antibiotic onslaught. 34. C. A basic knowledge of digestive processes is required (i.e., the stomach is a highly acidic environment, whereas the small intestine is slightly alkaline). The lower part of the graph shows that Enzyme A works best at a pH close to 2, while Enzyme B works best at a pH closer to 8. 35. A. Because the two enzymes have two different, non-overlapping pH ranges, they could not be at work in the same place at the same time. In addition, the graph does not refer to the temperature ranges of A and B (only X and Y). Although Enzyme A generally works more slowly than Enzyme B, neither enzyme works at all in pH 4.5. 36. B. The key to this question is the temperature range at which the two enzymes work. Only Enzyme X has a temperature range encompassing human body temperature (37ºC). An enzyme whose peak activity is close to 75ºC-80ºC (Enzyme Y) is unlikely to be found in the human body. Page 4 of 12 37. D. Both enzymes overlap between 40ºC and 50ºC. Choices A and B are too broad, and each includes a range of temperatures beyond which one of the enzymes cannot work. 38. B. When an enzyme is not active in a particular environment, it may be because that environment affects its confor...
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