Chapter 27: bacteria and archaea 1. identify the differences between bacteria, archaea, and eukarya, and the evolutionary relationships between the 3 groups 2. explain the ecological roles of prokaryotes: decomposers, producers, nitrogen fixers, pathogens, and various symbioses and recognize that cyanobacteria are the only group that has evolved the ability to carry out oxygen-producing photosynthesis 3. discuss the mechanisms of horizontal gene transfer, the widespread nature of this process in prokaryotes, and its importance in the evolution eukaryotic groups 4. describe major shapes, cell wall types, modes of nutrition used by bacteria and different responses to oxygen 5. define the following terms: halophile, extremophile, thermophile, methanogen, decomposer, nitrogen fixation, aerobic, anaerobic, photoautotroph, photoheterotroph, chemoautotroph, chemoheterotroph, transformation, transduction, conjugation, mutualism, commensalism, parasitism

Jerry wants to consume no more than 45% of his calories from carbohydrates. calculate his requirement for calories from carbohydrates based on a 2,500 kcal per day intake.

Where does all the water go? according to the environmental protection agency (epa), in a typical wetland environment, 39% of the water is outflow; 46% is seepage; 7% evaporates; and 8% remains as water volume in the ecosystem (reference: united states environmental protection agency case studies report 832-r-93-005). chloride compounds as residuals from residential areas are a problem for wetlands. suppose that in a particular wetland environment the following concentrations (mg/l) of chloride compounds were found: outflow, 60.4; seepage, 73.7; remaining due to evaporation, 26.4; in the water volume, 46.8. (a) compute the weighted average of chlorine compound concentration (mg/l) for this ecological system. (round your answer to one decimal place.) mg/l (b) suppose the epa has established an average chlorine compound concentration target of no more than 58 mg/l. does this wetlands system meet the target standard for chlorine compound concentration? yes. the average chlorine compound concentration (mg/l) is too high. yes. the average chlorine compound concentration (mg/l) is lower than the target. no. the average chlorine compound concentration (mg/l) is lower than the target. no. the average chlorine compound concentration (mg/l) is too high.

What best explains the inability for life to exist in earth early atmosphere