Lab Report 4 - Cell Membrane

Lab Report 4 - Cell Membrane - 1 INETLabReport4...

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1   INET Lab Report 4 Cell Membranes Student:    Email :   Date:    I. Diffusion Read the steps in  Exercise 4.1  carefully before proceeding.  Predict what you think the experimental outcome will be  in the space below. EXERCISE 4.1  – Factors influencing rate of diffusion 7.  Record the data. Potassium Permanganate R.T. Janus Green R.T. Time  (min) Total  Diameter (mm) Distance of  Diffusion *  (mm) Rate (mm/min) * Total  Diameter (mm) Distance of  Diffusion *  (mm) Rate (mm/min) * 0 6 0 0 7 0 0 15 6 0 0 12 5 1/3 30 9 3 3/15 15 3 1/5 45 9 0 0 16 1 1/15 Potassium Permanganate 5 Celsius Janus Green 5 Celsius Time  (min) Total  Diameter  (mm) Distance of  Diffusion *  (mm) Rate (mm/min) * Total  Diameter  (mm) Distance of  Diffusion *  (mm) Rate (mm/min) * 0* 6 0 0 9 0 0 15 6 0 0 10 1 1/15 30 6 0 0 13 3 3/15 45 6 0 0 14 1 1/15 Table 4.1 Diffusion of potassium permanganate and Janus Green * Distance diffused = diameter of each reading minus initial diameter
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2      Rate = distance in mm/elapsed time (min)
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3   8. Double click the chart below.  A spreadsheet will open.  Enter the data from  Table 4.1  into the spreadsheet in the  areas provided.  When you are finished, click into another area of the lab report.  The spreadsheet will close  automatically.  Do not close the spreadsheet with the X in the upper right corner.   Figure 4.2 Graph of rate of change in Table 4.1 What effect did temperature have on the rate of diffusion? It made the rate of diffusion less mm total overall How did molecule size affect the rate of diffusion? The smaller molecule was less affected What happens to the rate of diffusion over time?  Why? It went down because the cell had already reached it’s peak diffusion What can you conclude from this experiment? That small cells are less affected and that temperature varies diffusion rates II. Osmosis EXERCISE 4.2  – Osmosis demonstration 3. After 15 minutes, record the volume change in each tube ( Table 4.2 ). Osmometer
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This note was uploaded on 03/07/2011 for the course BIOL 1408 taught by Professor Mason during the Fall '08 term at Dallas Colleges.

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Lab Report 4 - Cell Membrane - 1 INETLabReport4...

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