126 midterm practice - midterm practice I Multiple Choices 1 The structure that causes formation of neural tissue in an overlying germ layer is

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1/29/09 midterm practice I. Multiple Choices 1. The structure that causes formation of neural tissue in an overlying germ layer is called the a. ectoderm. b. notochord. c. endoderm. d. neural crest. e. neural tube. 2. Which of the following statements about mutations of Sonic hedgehog and related genes is false ? a. They cause approximately 30 percent of stillbirths. b. They often result in a cyclopean (single) eye. c. They can lead to holoprosencephaly. d. They can transform granule cells, leading to medulloblastoma. e. They can transform basal epidermal cells, leading to basal cell carcinoma. 3. Neuroblasts a. give rise to neuronal precursor cells. b. are neurons that are slated to die or “implode” during development. c. are the most slowly dividing neuronal precursor cells. d. arise from symmetrical cell divisions. e. arise from asymmetrical cell divisions. 4. Which of the following does not play an important role in the establishment of axon tracts and in growth cone navigation?
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This note was uploaded on 01/15/2010 for the course BIO 31402 taught by Professor Lee during the Spring '09 term at University of California, Santa Cruz.

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126 midterm practice - midterm practice I Multiple Choices 1 The structure that causes formation of neural tissue in an overlying germ layer is

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