bio 349 sample exam fall 94

bio 349 sample exam fall 94 - BIO 349 Developmental Biology...

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BIO 349 Developmental Biology (K. Kalthoff) Exams Fall 1994 First Midterm Exam (11 October 1994) 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. 1/2. The animal pronucleus of an egg is defined by the excentric [off-center] position of the female pole and the polar bodies. 3/4. In the egg chambers of meroistic insects, the follicle cells synthesize RNA for the oocyte while the nurse cells contribute to vitellogenesis. 5/6. The fast block to polyspermy works by a change in cortical membrane potential while the slow block is part of the plasma reaction. 7/8. According to the principle of biological mechanisms, a given synergistic function is often supported by several independent mechanisms. 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 most adequate. 9. Sertoli cells are found a. in insect ovaries b. interspersed between seminiferous tubules in vertebrate testis c. within the seminiferous tubules in vertebrate testis d. none of the above is correct 10. 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 11. Superficial cleavage is characteristic of a. amphibians b. birds c. insects d. mammals 12. Localization of cytoplasmic determinants may occur a. during oogenesis b. upon fertilization c. during cleavage
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d. all of the above 13. The gray crescent in amphibian eggs a. is formed near the equator on the future dorsal side b. contains cytoplasmic determinants for the blastopore c. both of the above are correct d. none of the above is correct 14. Localized cytoplasmic determinants are demonstrated by a. autoradiography b. immunostaining c. both of the above are correct d. none of the above is correct 15. Embryonic cells are determined by a. localized cytoplasmic components b. induction c. both of the above are correct d. none of the above is correct 16. Imaginal discs are found in a. adult insects b. insect larvae c. mammalian embryos d. salamander lenses PICK THE ODD STATEMENT (1 point 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. 17. Polyspermy a. Polyspermy means a male produces more sperm than eggs are produced by a female of the same species. b. Polyspermy is avoided in most animals because it leads to abnormal chromosome numbers. c. A change in the electric potential across the egg membrane may serve as a fast block to polyspermy.
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This note was uploaded on 08/24/2009 for the course BIO 349 taught by Professor Wallingford during the Fall '09 term at University of Texas.

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bio 349 sample exam fall 94 - BIO 349 Developmental Biology...

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