Created by StemPy LabTwo strains of Escherichia coli grow in the same flask with plenty of food. Strain A doubles every and strain B doubles every . At time zero the flask holds times as many cells of strain B as of strain A. After how many minutes do the two strains have equal numbers? Assume that both keep growing exponentially and that the strains do not affect each other. Give a whole number of .
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← An enzyme follows Michaelis-Menten kinetics with Vmax = 200 µmol min⁻¹ and Km = 2.0 mM. At a substrate concentration of 4.0 mM it works at a certain rate. A competitive inhibitor with Ki = 1.5 mM is then added at 3.0 mM. To bring the rate back to its original value, the substrate concentration must be raised to what value, in mM? Give a whole number.Two large populations of the same species each mate at random. Population X has 600 individuals and the frequency of a recessive allele a is 0.10. Population Y has 400 individuals and the frequency of a is 0.40. Before the next breeding season all 1000 individuals mix completely and breed at random as one population. The trait is autosomal with complete dominance. What fraction of the next generation is expected to show the recessive trait? →
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