bio 349 sample exam summer 96

bio 349 sample exam summer 96 - BIO 349 Developmental...

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BIO 349 Developmental Biology (K. Kalthoff) Exams Summer 1996 First Midterm Exam (19 June 1996) MULTIPLE CHOICE (1 point each) In the following questions or statements, circle the letter associated with the one answer or version of the statement that you consider to be the correct one. 1. Which two membranes fuse during the acrosomal reaction? a. acrosomal membrane with egg plasma membrane b. sperm plasma membrane with egg plasma membrane c. both of the above are correct d. none of the above is correct 2. Cells are considered to be determined when a. their potency equals their fate b. their potency is larger than their fate c. both of the above are correctM d. none of the above is correct 3. Neurulation in amphibians involves a. elongation of neural plate cells b. constriction of the apical surfaces of neural plate cells c. Cell intercalation d. all of the above are correct 4. The anteriormost portion of the brain rudiment is called the a. diencephalon b. mesencephalon c. myelencephalon d. telencephalon 5. Transplantation of the dorsal blastopore lip from an amphibian gastrula to the ventral non-involuting marginal zone of another amphibian gastrula changes the fate of a. host ectoderm b. host mesoderm c. both of the above are correct d. none of the above is correct PICK THE ODD STATEMENT (1point each) For the following questions, either three of the statements are correct and one is false, or three are false and one is correct. Pick the one odd statement, be it correct or false, and circle the respective letter. 6. Cell Determination a. Cell determination is characterized by the synthesis of abundant proteins. b. The potency of undetermined cells is identical with their fate. c. Clonal analysis can be used to assess the degree of cell determination. d. The determined state of cells is always never reversible. 7. Morphogenetic Movements
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a. Delamination is the splitting of one cell layer into two parallel layers. b. Epiboly is the spreading movement of an epithelial layer over a deeper cell layer. c. Invagination is the local inward buckling of an epithelium. d. Involution is the migration of single cells from an epithelial layer into an embryonic cavity. 8. Localized Cytoplasmic Determinants a. The polar lobe of mollusks shunts vegetal cytoplasm into the D cell lineage. b. Bicoid mRNA serves as a muscle determinant in Drosophila. c. The polar granules of insects are located at the anterior egg pole. d. The yellow myoplasm of ascidians acts as a germ cell determinant. EXCHANGE WORDS (2 points per pair) The following statements are erroneous. However, each one can be corrected by exchanging two single words. Circle these two words within each statement. 9/10. By applying the acrosome technique, researchers have shown that bindin is localized on the acrosomal process of sea urchin sperm that have undergone the immunostaining reaction. 11/12. Involution is defined as the flowing of an expanding outer epithelium over the inside of an opening
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bio 349 sample exam summer 96 - BIO 349 Developmental...

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