• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

IB biology Respiration IA

Extracts from this document...


Name: Wesley Towstik LAB: THE EFFECT OF EXERCISE ON CELLULAR RESPIRATION Introduction: Cellular respiration is the process that cells use to break down glucose; this releases energy that is used to produce ATP. Cellular respiration involves a series of enzyme-catalysed reactions. The equation below shows the complete oxidation of glucose during aerobic cellular respiration. Oxygen is required for this energy-releasing process to occur. C6H12O6 + 6O2 --> 6CO2 + 6H2O + 686 kilocalories of energy/mole of glucose oxidized By studying the equation above, you will notice there are three ways cellular respiration could be measured. One could measure the: 1.Consumption of O2 2. Production of CO2 3. Release of energy during cellular respiration1 In this experiment the relative rate of CO2 production will be measured. Bromthymol blue (BTB) is an indicator that turns yellow in the presence of an acid. Since CO2 combines with H2O to produce carbonic acid, BTB can be used to detect the presence of CO2. Since exercising requires more energy than resting, the effect of the cellular respiration of exercise on CO2 production will be tested; the time it takes BTB to turn from blue to yellow will be measured after different time increments of exercising. ...read more.


/ (Total Number of Trials) Increment One = 30 seconds Total Number of Trials = 27 Average Time for color change of BTB per increment = (45.46+20.69+26.45+36.31+36.73+25.21+31.07+32.28+35.16+34.29+35.83+27.87+29.37+33.07+34.60+43.58+35.54+39.54+24.15+53.66+29.01+52.00+42.78+42.00+42.00+35.16+31.54)/(24) Average Time for color change of BTB per increment one of 30 seconds = 35.38seconds Average Time for color change of BTB per increment two of 60 seconds =29.69seconds Average Time for color change of BTB per increment three of 90 seconds = 20.68 seconds Sample Calculation for Standard Deviation Input column "Increment One 30 seconds" into Graphing Calculator Calc "1-Var Stats" One Standard Deviation = 7.966757375 seconds Round to 4 Significant digits because smallest unit of data is 4 Significant digits One Standard Deviation = 7.968 seconds One Standard Deviation "Increment One 30 seconds"=7.968 seconds One Standard Deviation "Increment Two 60 seconds"= 9.850 seconds One Standard Deviation "Increment Three 90 seconds" = 5.669 seconds Sample Calculation for T-Test 1. Identify the Null Hypothesis The average time it takes to change the color of BTB between increment one and increment two are not significantly different. 2. Identify the Significance Level (a), (a) = .05 3. ...read more.


In order to improve the lab and prevent error while also remaining within time constraints the procedure should be modified with at least two changes. First a formal method for identifying when a color change has actually occurred should be introduced into the lab. This method would first exhibit a quick demonstration of the original color of BTB and then a sample run through of procedure until the BTB changes from a dark blue to a dark green so that everyone can observe what a change in color looks like. While the BTB may become a different color before its change to dark green, throwing off accuracy slightly, precision will be maintained minimizing error. Second, the straw length should be increased to a point where it will be allowed to immerse into the BTB fluid. This would allow whatever CO2 is produced by the user to sufficiently reach the BTB and would allow the rate of color change to be accurately gauged. Furthermore with the modification of straw length a formal method for breathing should be developed so that way the subject does not accidentally inhale BTB. This method would involve simple inhaling via the nose and then exhaling via the mouth. 1 (The College Board, 2001) ?? ?? ?? ?? Towstik 1 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Biology section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related International Baccalaureate Biology essays

  1. Research Question: Does the duration of exercise have an increased effect on a persons ...

    The error bars appearing on the graph do not overlap between increments one and two but do overlap quite a bit between increments two and three. This shows us that while the duration of exercise does increase heart rate as shown in comparing increments one and two, its effect on

  2. Enzyme IA Biology

    Place weightboat on electronic balance d. Press reset button on electronic balance zeroing out the balance e. Open liver Container f. Using Scalpel, make an incision on the liver cutting a small piece g. Place liver on weightboat h. Continue to add/remove level by making incisions with scalpels until 2.5g is gathered i.

  1. Ecology Design IA

    Throughout the year, the amount of sunlight (and essentially UV radiation) fluctuates according to the seasons and the Earth's orientation to the Sun. Furthermore, cloud cover as well as weather conditions on the rocky shore may influence an organism's inclination to be exposed to sunlight.

  2. Bio lab - Oxygen Consumption in germinating and non-germinating seeds

    The actual differences are calculated by subtracting the differences in control from the differences in germinating/non-germinating seeds. Temperature (�C�1�C) Time (min) Differences in Control (Beads) ml�0.01ml Differences in Germinating Seeds ml�0.01ml Actual differences in Germinating Seeds ml�0.01ml Differences in Non-germinating Seeds ml�0.01ml Actual differences in Non-germinating Seeds ml�0.01ml 7 0

  1. To investigate how aerobic exercise affects the heart rate

    the average pulse rate after each length of time to perform jumping jacks; 0, 1, 2, 3, 4 and 5 minutes. The average pulse rate is taken to obtain a more accurate result. From this, we can see that aerobic exercise clearly has an effect on the pulse rate as

  2. Drosophila Lab: Eye Color

    Record the cross number of the vial. This number will serve as a record as to which cross you obtained. These flies are the parental generation (P1) and have already mated. The female should have already laid eggs on the surface of the culture medium. The eggs represent the first filial, F1 generation and will be emerging from their pupal cases in about a week.

  1. Reaction Time

    But it is also interesting to know if participating in different sports result in different improving of one's reaction time. All sports do not carry out the same exercises and therefore do not give same results. In order to have a further understanding about this investigation we need to know more about the sports that were chosen to be investigated.

  2. Investigating the Effect of Increasing Exercise in Aerobic Respiration

    608±4.47 735±7.07 823±5.77 Table 3: Average values for different conditions The calculations for the new uncertainty value: The formula for calculating the average uncertainty is “1/ (sqrt (the number of terms))*uncertainty” (Formula) Before Exercise: 1/ (sqrt (5))*10 =4.47 μmol After 1 minute of exercise: 1/ (sqrt (2))*10 =7.07 μmol After

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work