E55-2010 exam 2

A notch signaling is necessary for in somite

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A. Notch signaling is necessary for in somite formation B. Notch signaling is sufficient to induce somite formation C. correlative data that Notch functions in somite formation D. both B and C E. none of the above are accurate ______9. The default state of the ectoderm of a frog blastula, shown by experiments in which the ectoderm is cultured alone, is to form: A. neural tube B. brain C. epidermis D. notochord E. somites ______10. When ventral endoderm of a frog blastula is cultured with the animal cap, what forms? A. organizer B. mesoderm tissues, but no organizer C. mesoderm tissues with a small percentage of organizer cells D. neural tube E. none of the above ______11. The metanephric kidney forms by a phenomenon known as: A. folding a flat sheet of cells B. invaginating a flat sheet of cells C. branching morphogenesis D. delamination E. epiboly ______12. The pronephric kidney is derived from the: A. paraxial mesoderm B. prechordal plate mesoderm C. neural plate D. intermediate mesoderm E. lateral plate mesoderm ______13. Somite formation occurs: A. by epithelial to mesenchymal changes in paraxial mesoderm cell identity B. by migration of paraxial mesoderm through the notochord C. by migration of paraxial mesoderm through the neural tube D. by mesenchymal to epithelial changes in paraxial mesoderm cell identity E. none of the above ______14. Somites give rise to: A. the prechordal plate B. the archenteron C. the organizer D. the limb and torso musculature E. none of the above
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E-55, Exam 2-2010: Name Page 4 of 8 ______15. The organizer secretes_____ and thus ‘induces’ neural fates: A. BMPs B. Anti-BMPs C. Notch ligands D. Nodal E. B-catenin ______16. After neural tube formation, neuron cell identities in the spinal cord are influenced by signals from: A. the notochord B. the epidermis C. the neural crest D. both A and B E. both B and C ______17. Adult bone cells A. derive from the intermediate mesoderm B. emerge from the somite C. emerge from the notochord D. fuse during the process of differentiation E. can be converted to cartilage by endochondral ossification ______18. Neural crest cells contribute to structures that arise from A. the ectoderm B. the endoderm C. the mesoderm D. both A and B E. all of the above ______19. The fly embryo exhibits______cleavage, and the frog embryo exhibits______cleavage. A. centrolecithal, mesolecithal B. isolecithal, mesolecithal C. mesolecithal, mesolecithal D. telolecithal, centrolecithal E. isolecithal, isolecithal ______20. Nodal signals induce mesoderm across the D-V axis in the frog, and a range of Nodal signal intensities are triggered by: A. maternal deposits of VegT alone B. maternal deposits of B-catenin alone C. zygotic production of VegT D. a combination of B and C E. a combination of A and B that is altered after successful fertilization
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A Notch signaling is necessary for in somite formation B...

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