The instructions in RED are the ones which are mark-bearing and need to be answered as part of the assignment. The instructions in BLACK tell you how to carry out the simulation

Diffusion simulation:

Open the website biologysimulations.com/diffusion-osmosis

Set the parameters: Side A you want 5 small molecules and zero of the other molecules.

Side B you want zero for all molecules.

Set the temperature to 10 degrees.

Click on “run simulation”

Record the time taken to reach equilibrium

Increase the temperature to 20,30,40,50 degrees and repeat. Do each temperature 3 times.

Fill the table below [5 marks]

Results table

Use Excel to calculate the mean and standard deviation. The functions are AVERGAGE and STDEV

Temperature (degrees Celsius)Time taken to reach equilibrium (s) 1st trialTime taken to reach equilibrium (s) 2nd trialTime taken to reach equilibrium (s) 3rd trialMean time (s)Standard deviation10     20     30     40     50     

Using Excel, plot a line graph of your results (including standard deviations) and paste it here. Do not forget to label axes and use the correct units [5 marks]

What do these results tell you about the effect of temperature on diffusion rate? [5 marks]

What is the mechanism by which this occurs (use the words kinetic energy in your answer) [5 marks]

Enzyme simulation:

Go to the simulation page:

biologysimulations.com/enzymes

Your goal is to convert 5 molecules of starch into glucose at two temperatures: 25 degrees and 50 degrees.

After 30 seconds, take screen shots of your simulations and paste them here: [10 marks]

Why were two different enzymes needed for this process? [5 marks]

Why did one of the simulations produce no glucose? [5 marks]

What do you think would happen if you ran the simulation at zero degrees? [5 marks]

Total marks=50

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