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Pro-motors, repressors, enhancers regulate what stage of gene exression? mRNA processing mRNA stability transcription chromatin remodeling Question 94 (2 points) Which ecological relationship best describes the relationship between a virus and its host? Commensalism Mutualistic Symbiotic Predator (parasite)/ Prey Question 96 (2 points) Which of the following is NOT something that is common between both mitosis and meiosis? Genetic variation stays the same Produces new cells Start with a single parent cell Similar basic steps Question 97 (2 points) A mutation that causes a STOP codon instead of an amino acid is called a mutation. silent deletion nonsense missesnse

In a culture of bacteria that is actively multiplying by transverse binary fission, are there any “old’ cells? Explain your answer. 3. Would you expect generation time to be a constant characteristic of a bacterial species? Explain your answer. 4. In the lag phase of growth, the number of bacteria remains constant. Does this mean the cells are dormant and inert? Explain your answer. 5. During log-phase growth of a bacterial culture, a sample is taken at 8:00 a.m. and found to contain 1,000 cells per milliliter. A second sample is taken at 5:54 p.m. and is found to contain 1,000,000 cells per milliliter. What is the generation time in hours?

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