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BIS 104 quiz a ans spring 2010

BIS 104 quiz a ans spring 2010 - BIS 104 quiz spring 2010 1...

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BIS 104 quiz spring 2010 1. In his initial set of experiments (Figure 1, p. 694) Mukouyama immunostained mouse E15.5 limb skin samples with fluorescently labeled antibodies directed against : (a) peripheral sensory nerves (PSNs); (b) arterial endothelial cells and (c) venous endothelial cells.The pattern of fluorescence in the stained samples was then observed and compared by scanning confocal fluorescence microscopy. Describe the RESULTS obtained in this experiment. (4 pts) The fluorescent staining pattern of the arterial ECs matched that of the PSNs in 15.5 day old embryo samples. The fluorescent staining pattern of the venous ECs did not match that of the PSNs in the same samples. . 2. Nature has imposed rather strict size limitations on eukaryotic animal cells. Karp discusses three possible biological reasons why most cells are so small. In one or two sentences each, describe two of these possible reasons. (4 pts) a) If a cell becomes too large, the plasma membrane surface area (PM) to cytoplasmic volume ratio becomes too small and prevents efficient exchange across the PM.
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