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Part A: Diffusion: Movement of Solutes across a Membrane
1. Summarize the results regarding the presence (+) or absence (-) of glucose and protein in the dialysis bag and beaker.
2. Explain the movement or lack of movement of protein and glucose across the dialysis bag membrane.
3. Which solution, that in the bag or that in the beaker, is hypotonic compared with the protein solution.
4. What factors affect the movement of molecules across a semipermeable membrane? Which factor plays the greatest role in biological systems. 5. Briefly explain what active transport is and how it differs from passive transport, especially in terms of concentration gradients.
Part B: Osmosis: Movement of Water across a MembraneQuestion 1. Define each term below in terms of solute concentration outside compared to the inside of the cell. You do not need to explain which direction water will move (3 pts).
a. Hypotonic -
b. Isotonic -
c. Hypertonic -
Diffusion and concentration gradients
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A multipass transmembrane protein is demonstrate schematically below. The boxes represent membrane-spanning segments and the arrow represents a site for cleavage of the signal sequence.
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Compute the number of molecules of gramicidin in eight ml of a 50nM solution. Suppose the same fraction of gramicidin remains as part of the membrane as the fraction of lipids.
In clinical applications of API 20 E Identification System for Enterobacteriaceae and Other gram-negative rods, reagents are added only if the glucose (oxidation/fermentation) test results is yellow or at least three other tests are positive.
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biotechnology allows the use of living organisms or their processes for human needs or purposes. currently this topic
explain the causes of workplace violence in america and consider strategies for prevention.your response should be at
Why do grasses contain a higher concentration of chlorophyll?
Some of the functions of the eukaryotic organells are performed in bacteria by the . . . . What is the difference between equilibrium potential and steady state potential?
Dr. Atkins claims that those who follow his diet will "fly high" emotionally when CHO are removed from the diet completely during the first week.
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