ex3_2007 - Name: _ Student ID:_ Page 1 Zoology 470 - Exam...

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Name: ______________________________________ Student ID:________________________ Page 1 Zoology 470 - Exam #3 – 2007 This exam has 6 pages and a total of 50 points . You will have 120 minutes to complete it. Answer all short answer questions as briefly as possible. Make sure your name and ID number are on all pages. 1. Provide concise definitions for each of the following ( 6 points ) a. nodal vesicular parcel (NVP): b. coelom: c. myotome: d.: phylotypic stage: e. regression of Henson's node: f. amniote: 2. Complete the following table referring to extraembryonic membranes in mammals. Note: only provide mammalian functions of the indicated membranes ( 4 points ). Membrane Double-layered tissue from which it is derived Major function(s) in mammals Amnion Chorion Yolk sac Allantois
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Name: ______________________________________ Student ID:________________________ Page 2 3. Circle true (T) or false (F) for each of the following ( 7 points ) T F The vertebrate homologue of the Drosophila protein hairy is expressed rhythmically as part of the "segmentation clock" in the somites of amniotes T F Siamois is a gene involved in differentiation of the Nieuwkoop Center, which forms on the ventral side of the early Xenopus embryo T F Repulsion between cells expressing Ephrin ligands and Eph receptors is unique to retinal axons interacting with the optic tectum T F Adrenal medulla cells form from neural crest that migrate over the dorsal surface of somites T F The notochord induces the differentiation of the overlying floor plate of the neural tube by secreting sonic hedgehog T F The umbilical vein is important in mammals because it carries oxygenated blood from the placenta back to the fetus T F The inner cells of the 32 cell mammalian embryo would be expected to be pluripotent, since they generate the cells of the inner cell mass of the blastocyst T F Knockdown of Cerberus expression in a frog embryo would be expected to result in loss of tail structures T F In vertebrates, the lungs originate as simple outpocketings of ectodermal tissue T F The organizer equivalent in zebrafish is called the embryonic shield T F Local cell shape changes, such as apical constriction, contribute to the invagination of the neural tube, but convergent extension does not T F Chordin is a secreted protein produced by the node in mice and the organizer in frogs that counteracts BMP signals, resulting in induction of epidermal tissue T F Ventral vegetal cells in the Xenopus blastula express the highest levels of nodal-related proteins,
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This note was uploaded on 04/07/2009 for the course ZOO 470 taught by Professor Hardin during the Spring '08 term at Wisconsin.

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ex3_2007 - Name: _ Student ID:_ Page 1 Zoology 470 - Exam...

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