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METHODS
We stuck flies to popsickle sticks by pushing their wings into a sticky wax werubbed on the sticks. Then we made a dilution series of glucose, maltose, and sucrose inone-half log molar steps (0.003M, 0.01M, 0.03M, 0.1M, 0.3M, and 1M) from the 1Mconcentrations of the sugars we were given. We tested the flies' sensory perception bygiving each fly the chance to feed from each sugar, starting with the lowest concentrationand working up. We rinsed the flies between tests by swishing their feet in distilled water.We counted a positive response whenever a fly lowered its proboscis. To ensure thatpositive responses were to sugars and not to water, we let them drink distilled water beforeeach test. See the lab handout Taste Reception in Flies (Biology Department, 2000) fordetails.RESULTSFlies responded to high concentrations (1M) of sugar by lowering their proboscesand feeding. The threshold concentration required to elicit a positive response from atleast 50% of the flies was lowest for sucrose, while the threshold concentration was highestfor glucose (Fig. 1). Hardly any flies responded to saccharin. Based on the results from all Fly?lab?report?p.?4 ????????????????????????????????Fly?lab?report?p.??the lab groups together, there was a major difference in the response of flies to the sugarsand to saccharin (Table 1). When all the sugars were considered together, this differencewas significant (t = 10.46, df = 8, p
Today we can determine the genetic makeup of individuals and determine whether they carry traits that are potentially harmful such as huntington's disease knowing this.
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Suppose the rate of plant growth on Isle Royale supported an equilibrium moose population of 380 moose. In this scenario, there are no wolves present, and the environment is stable. One day, 200 additional moose arrive on the island. What would you p..
Determine the time domain equation that describes the change in drug concentration, C(t) for a given step increase in infused drug concentration, M?
q1. sketch a diagram of a gene. draw a diagram of a piece of dna. transcribe the gene into mrna and then translate it
In operant conditioning.a. an animal improves its performance of a fixed-action patternb. an animal learns as a result of associating a benefit or harm with an action
For this assignment, visit your local grocery store to observe and record behaviors in the various aisles. Your visit should be long enough to observe several behaviors and situations. Read the assignment thoroughly before your observational visit in..
c. Which antibiotic(s), if any, will cells be resistant to ifthey have obtained a plasmid containing inserted foreign DNA? d. How would you distinguish recombinant and non-recombinant plasmids by agarose gel electrophoresis.
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diagram and describe how countercurrent exchange mechanism work use specify examples for 1. gas exchange 2.thermoregulation 3. osmoregulation and 4. reducing the evaporative water lose when breathing ( 1 example for each)
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