An arteriole with a radius of 30 μm, length of 1000 μm feeds into a set of 200 capillaries each with a radius of 4 μm and a length of 500 μm. the viscosity of the blood is 3*10^-3 pa*s and its density is 1.055 g/cm^-3. the input pressure to the arteriole is 100 mmhg and the output pressure at the end of the capillary is 15 mmhg. assume that the capillaries all come off the arteriole at the same place. a. assuming laminar flow, what is the resistance of this arteriole? b. what is the average velocity of blood through the arteriole?
c. how much time does the blood spend in the arteriole?

You are studying several alleles of an e. coli helicase gene. one allele, called rsr, confers resistance to rs2014, an antibiotic that works by inhibiting helicase activity. bacteria with the rss allele are sensitive to rs2014. another allele, called ts-, produces a temperature sensitive mutation of the helicase. in bacteria with the ts- allele, helicase is inactivated at 42 °c but functions normally at 37 °c. helicase functions normally at both temperatures in bacteria with the ts allele. you obtain the following data while testing four strains of e. coli at different temperatures and doses of rs2014. each number represents the percentage of maximal dna synthesis. based on this data, assign the appropriate genotype to strains a–d in the spaces provided