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Unformatted text preview: 1. Describe the following analogy: Receptors competing to be transported by the coated pit system can be compared to skiers joining a cable-car network. Entry onto specific a car is only permitted to ticket holders and there is no guarantee of the number of passengers in a car only that each car will arrive at the same destination. There are plenty of these types of cars and you can catch one just about any time. However some cars require maximum occupancy and will only arrive at the appropriate destination at certain times. 2. Thought question: Cells take up extracellular molecules by receptor-mediated endocytosis and fluid by pinocytosis. A paper that is comparing the efficiency of the two pathways was done by either treating cells with epidermal growth factor (EGF) [requires receptor] or horseradish peroxidase (HRP) [no receptor]. The scientist found that the uptake of HRP was linear and the uptake of EGF was elliptical. Explain why the shapes of the curve were different for HRP and EGF endocytosis:...
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- Spring '09
- cell biology