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Unformatted text preview: Biology with Calculators 23A - 1 Experiment 23A Effect of Temperature on Cold-Blooded Organisms In cold-blooded organisms, poikilotherms , there is a link between the temperature of the environment and the organism’s metabolic rate. Reptiles are a common example of a cold- blooded organism with which most people are familiar. If you have ever seen a lizard or snake in the early morning when the air and ground are cool, you may have noticed how slowly they move. They move slow when the environment is cold because they require heat from their surroundings to increase their internal temperature and metabolism. Once their internal body temperature has warmed, they can metabolize foods more quickly and produce the energy they need. Oxidative respiration is the process of metabolism where sugars are broken down. Under aerobic conditions, respiration yields chemical energy, carbon dioxide, and water. C 6 H 12 O 6 + 6 O 2 → 6 CO 2 + 6 H 2 O + energy glucose oxygen carbon water dioxide Crickets will be used to study the effect of temperature on the metabolism of cold-blooded organisms. You will determine how temperature affects the respiration rate of crickets by monitoring oxygen consumption with a O 2 Gas Sensor. 1. Figure 1 MATERIALS LabPro or CBL 2 interface 250-mL respiration chamber TI Graphing Calculator 600-mL beaker DataMate program 1-L beaker Vernier O 2 Gas Sensor thermometer crickets or mealworms two 400-mL beakers balance basting bulb Graphical Analysis (optional) 23A - 2 Biology with Calculators Experiment 23A PROCEDURE 1. Plug the O 2 Gas Sensor into Channel 1 of the LabPro or CBL 2 interface. Use the link cable to connect the TI Graphing Calculator to the interface. Firmly press in the cable ends. 2. Turn on the calculator and start the DATAMATE program. Press CLEAR to reset the program. 3. Set up the calculator and interface for an O 2 Gas Sensor. a. Select SETUP from the main screen. b. If the calculator displays OXYGEN GAS (PCT) in CH 1, proceed directly to Step 4. If it does not, continue with this step to set up your sensor manually. c. Press ENTER to select CH 1. d. Select OXYGEN GAS from the SELECT SENSOR menu....
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- Spring '00
- metabolic rate, water bath