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The Conditional Tense: Complete the following sentence using the correct verb form. Nosotros nos ______________ hoy, pero no podemos. (casar)

Explain in your own words pharmacokinetic tolerance and pharmacodynamic tolerance. Give specific examples of each with specific drugs and explain why it is either pharmacokinetic tolerance or pharmacodynamic tolerance.

List 3 causes for the increase in rate of species extinction that has happened coincident with the rise in human population. (answers will be checked manually to account for slightly different phrasing etc.) [answer1] [answer2] [answer3]  

Adapted from Floder and Sommer (1999) In an experiment communities of plankton in a lake were isolated in long cylinders submerged in a lake.  These cylinders were subjected to mixing (by bubbling air up through them) at various frequencies (ranging from every 2 days to never disturbed).  Diversity and species richness were measured after 36 days and the following data were obtained.  What relationship between diversity/richness and disturbance do these data support?  

In an effort to understand causes of algal blooms in coastal Rhode Island, researchers conducted an experiment in estuarine mesocosms.  They set up 8 mesocosms, 2 replicates of each treatment (see table with treatments below).  After several weeks, they measured chlorophyll a (as a measure of algal productivity).  This is a preliminary study, but for our purposes, let’s assume the differences across treatments are real.   Abbreviation Treatment C No nutrients added.   N Nitrogen added. P Phosphorus added NP Nitrogen and Phosphorus added Here is a graph of the results. Given the above data, it would be reasonable to conclude that [limiting] in this system.  Based on what you know about N and P cycles, the forms of N and P added to the mesocosms for this experiment were likely [nandp].  The ecological problem they are probably trying to address is [ecologicalproblem].    

Imagine a team in the class is interested in combating desertification.  For each of their ideas below, use the drop down to select the course concept that fits with it.   Plant drought tolerant shrubs in areas that presently lack vegetation. This will aid in the process of [idea1] These drought tolerant shrubs will form root systems that keep water in the area and shade other plants from the harsh sun, making it easier for other species to colonize.  This is based on the concept of [idea2]

According to the model of island biogeography (choose “yes” next to each true statement about island biogeography) 1. Islands close to the mainland will have higher extinction rates than islands than islands far away [ans1] 2. Islands close to the mainland will have higher immigration rates than islands far away [ans2] 3. Small islands will have higher extinction rates than large islands [ans3] 4. Small islands will have higher immigration rates than large islands [ans4]

A deep sea vent releases hydrogen sulfide and other chemicals into the water.  Microbes, such as the bacterium Arcobacter sulfidicus, use the energy from oxidizing these hydrogen sulfide molecules to power the synthesis of carbon compounds such as glucose.  Several species of vent shrimp feed on mats of A. sulfidicus bacteria.  Vent rat fish feed on these shrimp (see image below).  We will focus on just these three species, although other organisms are involved in these interactions.  Use this scenario to answer the 5 questions that follow.    

IMPORTANT! Before leaving the room today you need to check in with Dr. Prescott, Dr. Kirkpatrick, Georgia or Navroz so we can confirm that your exam submitted successfully.  Thank you and have a wonderful summer!

From Tilman and Downing. 1994.  Researchers measured a variety of parameters every year in grassland plots that had been planted with different species richnesses.  One year there was a severe drought.  The researchers compared the biomass of plants in the year following the drought to the biomass of the plants in the year preceding the drought and got the following data.  What are reasonable conclusions from these data? Choose “supported” or “not supported” for each statement.   *numbers in graph indicate how many plots had that number of species. Plots with high species richness (compared to those with very low species richness) had greater resistance to the effects of the drought on biomass. [ans2] The drought decreased species richness[ans3] If we assume that the species rich plots are also higher in diversity, these data support the diversity-stability hypothesis[ans4] These data support the intermediate disturbance hypothesis.[ans5]