Some members of a photosynthetic plant species are genetically resistant to an herbicide, while other members of the same speciesare resistant to the herbicide. Maintaining resistance against theherbicide is metabolically metabolically expensive for the plants. Which combination of events should cause the most effective replacement of the non-herbicide-resistant strain of […]

Salmonella enterica is closely related to Escherichia coli. It can be infected with the F plasmid, which can integrate into the chromosome to produce Hfr strains.These can be mated with F- E. coli to study the order and time of entry of genetic markers. The data shown here pertain to […]

You are a CDC (Center for Disease Control) researcher studying malaria. Your goal is to understand the evolution of malaria in order to be able to possibly predict where a future outbreak may be. To do this you will be using information from the evolution of the pathogen, the host, […]

1. Briefly describe the three levels of organization ecologists’ use: population, community, and ecosystem. Give an example of each using a well-known city. 2. Explain why the biosphere is considered closed and patchy. 3. Using the ecosystem of a suburban area, explain how the following abiotic factors influence plant growth […]