How do scientific models provide a practical solution for some types of research? check all that apply.
models are beautiful displays created for public enjoyment.
models are simplified representations of objects or systems.
models allow scientists to study an unlimited number of subjects.
models make it possible for scientists to study very complex systems.
models make it possible for scientists to study very large or very small objects.

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