Essay about Laboratory #1 - Cell Physiology

1037 WordsMay 17, 20125 Pages
Review Sheet 1 Results 1. Describe two variables that affect the rate of diffusion. Your answer: Two variables that affect the rate of diffusion are the MWCO membrane and the solute concentration. Increasing the membrane size and solute concentration will also increase the average diffusion rate. Decreasing the membrane size and solute concentration will reduce diffusion rates and can even prevent all diffusion. 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? Your answer: The urea was not able to diffuse through the 20 MWCO membrane because the molecular weight was too high. For a molecular weight of 60.07, a larger membrane would need to be…show more content…
2. The larger value obtained when more glucose carriers were present corresponds to an increase in the rate of glucose transport. Explain why the rate increased. How well did the results compare with your prediction? Your answer: The rate increased because the glucose was easier to transport with more carriers. Saturation levels decrease when carriers are added and glucose concentrations are constant. The results were the same as my prediction that assumed the glucose transport rate would increase. 3. Explain your prediction for the effect Na+ Cl- might have on glucose transport. In other words, explain why you picked the choice that you did. How well did the results compare with your prediction? Your answer: My prediction for the effect Na+Cl- might have on glucose transport was that the glucose transport rate would decrease. I picked this choice because I thought having Na+Cl- in one beaker would limit the space needed for proper glucose diffusion. All of the other runs involved water, so I predicted that adding a new solute could slow diffusion. The results opposed my prediction because the Na+Cl- had no effect on the glucose diffusion rate. Review Sheet 3 Results 1. Explain the effect that increasing the Na+ Cl- concentration had on osmotic pressure and why it has this effect. How well did the results compare with your prediction? Your answer: The effect that increasing Na+Cl- concentration had on osmotic pressure was that the pressure also
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