Given a log phase bacterial culture with 1 x 106 cells per ml and a generation time of 30 minutes, how long does it take the culture to reach a density of 6.4 × 107 cells per ml?
A. 1 hour
B. 2 hours
C. 3 hours
D. 4 hours
Answer: C
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a. an increase in membrane permeability b. an enzyme-substrate cascade c. an inhibition of protein synthesis d. a change in gene expression e. increased DNA replication activity
Gene therapy is being used in cancer patients to make healthy cells more tolerant of chemotherapy and to make tumors more vulnerable to chemotherapy.
Answer the following statement true (T) or false (F)
Which location might exhibit the greatest variation in temperatures throughout the seasons?
A) a small town at sea level in Panama B) San Diego, California C) a city in Finland D) Rome, Italy
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A. They replicate most effectively at the cooler temperatures of the upper respiratory tract. B. IgA antibodies in lower respiratory tract secretions prevent them from becoming established in the lower respiratory tract. C. The prevalence of alveolar macrophages in the lower respiratory tract prevents them from becoming established there. D. They are unable to attach to receptors on the pulmonary cells in the lower respiratory tract.