N152MidtermFall2010 - Bio Sci N152 Fall 2010 Midterm NAME...

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1 Bio Sci N152, Fall 2010 Midterm NAME: __________________________________________ STUDENT ID NUMBER: __________________________________________ Part I--Short Answer (each question is worth 1 point) 1. Name one secondary zone of neurogenesis: ___________________ 2. ___________________ secreted from the dorsal aorta induces neural crest progenitors into sympathetic neurons. 3. In C. elegans , the term ___________________ refers to the observation that when neural progenitors are ablated all of the neurons from that lineage are lost and cannot be replaced. 4. Naturally occurring programmed cell death is called ___________________. 5. The embryonic process that leads to the formation of three germ layers is called ___________________. 6. The organizer in chick embryos that most closely resembles Spemann’s organizer is called ___________________. 7. The “default” fate for ectodermal tissue is ___________________; however, in some tissues this fate is normally inhibited by ___________________. 8. In the vertebrate nervous system, levels of which diffusible factor regulate hox gene expression? ___________________ 9. Neurogenesis gives rise to ___________________ and ___________________. 10. “Birthdating” studies provide information on when neurons underwent their final mitotic division. What is the best experimental approach to identify the birthdates of neurons? __________________________________________________________________ 11. The temporally coordinated expression sequence of transcription factors such as hunchback and krueppel in drosophila neuroblasts depends on ___________________. 12. The Boss gene is expressed in photoreceptor 8 and encodes a ligand for Sevenless, a receptor tyrosine kinase. Null mutations in Boss result in a loss of which cell types in the drosophila eye? ___________________ 13. Name a morphogen that specifies the dorsoventral axis: ___________________
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2 Part II--Multiple Choice (each question is worth 1 point) 1. Transplantation of a Xenopus Spemann organizer to the opposite side of an age- matched Xenopus host is what type of manipulation? a. isochronic and homotopic b. isochronic and heterotopic c. heterochronic and homotopic d. heterochronic and heterotopic e. none of the above 2. Which of the following organisms has an entirely stereotyped cell lineage that has been characterized? a. Drosophila melanogaster b. Caenorhabditis elegans c. Xenopus laevis d. Danio rerio e. Mus musculus 3. A candidate molecule is added to an animal cap. Mesoderm tissue is first induced and then neural tissue. The candidate molecule is what? a. a direct inhibitor b. a direct inducer c. an indirect inhibitor d. an indirect inducer e. an indirect ventralizer 4. What two types of tissue share a common lineage? a.
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This note was uploaded on 12/13/2011 for the course BIOSCI 93 taught by Professor Staff during the Fall '11 term at UC Irvine.

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N152MidtermFall2010 - Bio Sci N152 Fall 2010 Midterm NAME...

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