Lab Manual Introductory Biology (Version 1.4) © 2010 eScience Labs‚ LLC All rights reserved www.esciencelabs.com • 888.375.5487 2 Table of Contents: Introduction: Lab 1: The Scientific Method Lab 2: Writing a Lab Report Lab 3: Data Measurement Lab 4: Introduction to the Microscope Biological Processes: Lab 5: The Chemistry of Life Lab 6: Diffusion Lab 7: Osmosis Lab 8: Respiration Lab 9: Enzymes
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a selectively permeable membrane from higher to lower concentrations. A selectively permeable membrane allows only some thing to go through. Water and oxygen are examples of molecules that are able to go through the membrane by diffusion. The net movement of these particles happens down the concentration membrane. Both diffusion and osmosis
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was to see how easily molecules of smaller diameter‚ which were starch molecules‚ would pass through an artificial membrane‚ as opposed to how difficult it would be to pass through in the case of larger molecules‚ which were IKI molecules. Results were that the smaller substance passed though the membrane easily and rather quickly‚ and the larger substance did not penetrate the membrane whatsoever. Part III of the lab was to view the effect of molecular size on the rate of diffusion. Two substances
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occurs. Dialysis bags were filled with three different concentrations of sucrose solutions and two with water. They were then completely immersed in water with the exception of one dialysis bag‚ which was filled with water and immersed in a sucrose solution. The weight of the bags were then monitored and recorded at regular 15-minute intervals. The variety of concentrations
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solutes move through the 20 MWCO membrane? Why or Why not? 2. Did Na+Cl- move through the 50 MWCO membrane? Activity 2: 1. Are the solutes moving with or against their concentration gradient in facilitated diffusion? 2. What happened to the rate of facilitated diffusion when the number of carrier proteins was increased? 3. In the simulation you added Na+Cl- to test its effect on glucose diffusion. Explain why there was no effect. Activity 3: 1. Which membrane resulted in the greatest pressure
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REVIEW SHEET EXERCISE 1 Cell Transport Mechanisms and Permeability 1. Match each of the definitions in Column A with the appropriate term in Column B. Column A Column B __E___ term used to describe a solution that has a lower concentration of solutes compared to another solution ___G__ term used to describe a solution that has a higher concentration of solutes compared to another solution ___A__ the movement of molecules from an area of higher concentration to an area of lower concentration
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Cells must move materials through membranes and throughout cytoplasm in order to maintain homoeostasis. The movement is regulated because cellular membranes‚ including the plasma and organelle membranes‚ are selectively permeable[1]. The purpose of an automatic flow of molecules is to create equilibrium on each side of the membrane. In order for molecules to pass through the membranes‚ there must be pores. The size of the pore determines what molecules can cross. Due to the size and polarity‚ only
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Physioex 9.0 Review Sheet Exercise 1 Cell Transport Mechanisms and Permeability Name Lab Time/Date ___ Activity 1 Simulating Dialysis (Simple Diffusion) 1. Describe two variables that affect the rate of diffusion. Size of material and concentration 2. Why do you think the urea was not able to diffuse through the 20 MWCO membrane? How well did the results compare with your prediction? The molecules were too large to pass through. This is what I predicted
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regions of lower water potential across a selectively permeable membrane. Osmosis deals only with water. In this experiment we tested osmosis in a nonliving system. My prediction for this experiment is that all five of the bag will change colors after being immersed in solution. To test my prediction we tested five dialysis bag in five different solutions. Materials: 30 presoaked 15 cm lengths of 44mm flat diameter dialysis tubing per lab Twine 1% starch
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a different temperature. One for a low temperature‚ one for room temperature‚ one for medium and finally one to test a high near boiling temperature. The water was measured to 200 mL and each cell had a cell placed inside it made from dialysis tubing. The cells had 10 mL of sucrose within tied together or clamped tight to preserve the solution. The temperatures and initial cell mass recorded‚ the experiment began and was timed for 30 minutes. After that time‚ the cells were removed
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