A biologist exposes mice to mutagenizing X rays to generate an array of different mutants. He hopes to generate a mutant form of acetylcholinesterase that will be functional at normal body temperature but inactive at a higher temperature. Which step below would work as an initial screening step in the biologist's quest to eventually identify a mutant of this type?

Look for mice with normal muscle contraction–relaxation activity at normal body temperature that develop continuous muscle contraction during an induced fever.

Look for mice that develop hyperactivity and rapid muscle movements as their body temperature changes from normal to the higher temperature of an induced fever.

Look for mice with a normal response to loud noise that become more easily startled by the same noise stimulus as their body temperature rises during an induced fever.

Look for mice with normal muscle contraction–relaxation activity at normal body temperature that develop an inability to contract muscles during an induced fever.

What types of energy transfers and energy transportations are involved in the domino chain reaction?

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.

Why do we perceive objects as retaining their brightness under different lighting levels?