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Explain why 02 can pass through the plasma membrande but ions must use transmembrane proteins
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- Identify the factor whcih usually effect or influence diffusion rates.Describe the two types of passive transport. Explain what kind of proteins are required for each type of passive transport and highlight the similarities and differences of these proteins.6) Consider the mechanism of net NaCl secretion across an epithelium shown below (in attachment) What provides the driving force for Cl- entry through the basolateral membrane into cell?
- Without saturation of transport proteins and under the same concentration gradient how can the speed of simple diffusion be compared to the speed of facilitated diffusion?Define Transcellular and paracellular pathways oftransepithelial transport.Name the three classes of membrane transport proteins. Explain which one or ones of these classes is able to move glucose and which can move bicarbonate (HCO3 −) against an electrochemical gradient. In the case of bicarbonate, but not glucose, the ΔG of the transport process has two terms.What are these two terms, and why does the second not apply to glucose? Why are cotransporters often referred to as examples of secondary active transport?
- Describe the difference between carrier proteins and channel proteins. What is required for the passive transport of molecules through these membrane proteins?Discuss carrier-mediated transport. How could you experimentally distinguish between the different types of carrier-mediated transport?Name the three classes of membrane transport proteins. Explain which one or ones of these classes is able to move glucose and which can move bicarbonate (HCO3−) against an electrochemical gradient. In the case of bicarbonate, but not glucose, the ΔG of the transport process has two terms. What are these two terms, and why does the second not apply to glucose? Why are cotransporters often referred to as examples of secondary active transport?
- Define osmosis and describe the effects of placing red blood cells in the following solutions 1, Hypertonic salline solution (3%Nacl) 2, Hypertonic salline solution (0.45%Nacl) 3,Isotonic/normal salline (0.9%Nacl)What is the Description and Examples in the body of these Cell transport? Explain in 2-3 sentencesDescription:Examples in the body: 1. Bulk Transport 2. Phagocytosis 3. Pinocytosis 4. Receptor-Mediated EndocytosisDiscuss why the following affect the rate of diffusion: molecular size, temperature, solution density, and the distance that must be traveled