bis_104_sample_exam_key_07 - Page 1

bis_104_sample_exam_key_07 - Page 1 - BIS 104 NAME _ (last)...

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BIS 104 NAME _________________________________________ (last) (first) MIDTERM EXAMINATION Consider the following in vitro experimental protocol: A pure population of undifferentiated endothelial cells (PECAM-1 positive; EphB2 negative; EphB4 negative) are was isolated from mouse embryo limb skin. These cells are from transgenic mice that have the gene coding for Green Fluorescent Protein (GFP) linked directly to the gene that codes for EphB2, a cell surface protein found only on differentiated arterial cells. These undifferentiated endothelial cells were co-cultured with a pure population of mouse Schwann cells for 2 days. After 2 days of co-culture you perform a series of experiments to test various aspects of a two part hypothesis, given below: (a) Schwann cells are capable of inducing endothelial cells to differentiate into arterial cells. (b) The Schwann cells accomplish this induction by synthesizing and secreting the growth factor protein, VEGF, which then acts through a receptor protein on the surface of
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