molecules can pass through while water molecules cannot. 3. Why do you think the urea was not able to diffuse through 20 MWCO? How well did the results compare with your predictions? The urea was not able to diffuse through 20 MWCO because the size of the pores of 20 MWCO was too small to allow the large size of molecules of urea to pass through. Since‚ the molecular weight of urea is 60.07‚ the molecules of urea were too large to enter the pores of the 20 MWCO. 4. Describe the result of the
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of eight different tests to identify the unknown. Material and Methods Eight different prepared types of media were provided to use to identify the unknown bacterium. They were a Gelatin Tube‚ MR Tube(Methyl Red)‚ VP Tube(Voges-Proskauer) Urea Tube‚ SIM Tube(Sulfur Indole Motility)‚ Citrate Slant‚ TSIA Slant (Triple Sugar Iron Agar) and Oxidase. Each one of the tubes and slants were inoculated using either the streaking or stabbing technique with one of the colonies from the growth of the
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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 used. The results opposed my prediction because the urea did not diffuse at all. I predicted that it would diffuse‚ but very slowly
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Why do you think the urea was not able to diffuse through 20 MWCO? How well did the results compare with your predictions? The urea was not able to diffuse through the 20 MWCO because the membrane pores are too small and the urea molecules are large. The molecular weight of Urea is 60.07 g/mol which is too large thus the molecules were not able to pass through the pores of the 20 MWCO. The results that I obtained from the experiment agreed with these predictions because urea was no able to diffuse
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Observation: A. Color‚ pH and Specific Gravity Own Urine A-1 Color _____________________ A-2 pH _____________________ What is your interpretation of the above test? B. Urea Own Urine Effect on Litmus __________________ What is your interpretation of the above test? C. Uric acid Own Urine Crystals __________________ What
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Negative cystine digestion | Citrate Utilization | To determine the organism is able to utilize citrate as a carbon source | Citrate slant (green) & Bromthymol blue | Color changed from green to deep blue | Positive for citrate utilization | Urea digestion | To determine the ability of an organism to catabolize ammonia | Phenolmed | Color didn’t change stayed bright
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35.45 3. Which MWCO dialysis membranes allowed both of these ions through?50‚100‚ 200 4. Which materials diffused from the left beaker to the right beaker? Urea‚ NaCl and glucose diffused 5. Which did not? Why? Albumin was too large to diffuse into the right beaker. Activity 2: Simulating Dialysis 6. What happens to the urea concentration in the left beaker (the patient)? Its concentration gradient changes and causes it to move down. 7. Why does this occur? It happened because the
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permeability to polar substances) b. The structure of the molecule undergoing diffusion (eg. steric conformation‚ size‚ polarity‚ amount and strength of hydrogen bonding) 2. Urea was not able to diffuse through the 20 MWCO because the pores of the membrane were too small for the urea to pass through. The molecular weight of urea is 60.06 g/mol‚ over three times greater than the 20 MWCO. 3. Glucose was able to diffuse through the 200 MWCO pore because it was small enough‚ having a molecular weight
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Biology Topic One Maintaining a Balance 1. What are enzymes? Identify their role in metabolism. 2. Enzymes are made up of ____________‚ _____________‚ ______________ and ________________. 3. Enzymes are large __________ that are coiled up to form an ____________ __________. 4. The molecule that the enzyme acts on is called the ______________. 5. Use a model to illustrate how enzymes work. 6. Explain how enzymes
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the rate of diffusion are size and whether or not there is an electrical or concentration gradient. 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? a. My prediction was incorrect. I think the urea was not able to diffuse through the 20 MWCO membrane because the molecular weight of urea is about 60. This means it is above the molecular weight cut off and cannot diffuse. 3. Describe the results of the attempts
Free Diffusion Molecular diffusion Sodium chloride