practicefinal07F

practicefinal07F - 1. Changes to the cytoskeleton occur...

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1. Changes to the cytoskeleton occur rapidly in response to signals because: A actin filaments are rapidly transported to new locations in the cell B actin filaments are polymers assembled from subunits that can assemble and depolymerize rapidly C cells can rapidly increase the rate of translation of actin mRNA D cells accumulate large amounts of stored mRNAs for actins E all of the above 2. Homophilic interactions: A are mediated by cadherins B occur across compartment boundaries C involve signaling between epithelium and mesenchyme D require the extension of filipodia E all of the above 3. The mesonephric duct forms as a result of: A an invagination of the endoderm B compaction of lateral plate mesenchyme C a mesenchymal to epithelial transformation D an inductive signal from the gonad E branching morphogenesis 4. Somite formation from the unsegmented mesoderm is controlled by a gradient of FGF8 that is higher at the posterior and lower at the anterior. FGF8: A inhibits somite formation B promotes somite formation C dorsalizes somites D ventralizes somites
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This note was uploaded on 03/19/2008 for the course MCDB 138 taught by Professor Lyon during the Fall '07 term at UCLA.

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practicefinal07F - 1. Changes to the cytoskeleton occur...

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