BIO 349 sample exam summer 97

BIO 349 sample exam summer 97 - BIO 349 Developmental...

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BIO 349 Developmental Biology (K. Kalthoff) Exams Summer 1997 First Midterm Exam (23 July 1997) EXCHANGE WORDS (Maximum 2 points each) The following statements are erroneous. However, each one can be corrected by exchanging (swapping) two single words. Circle these two words within each statement. A hyphenated word counts as one word. 1./2. Meroblastic cleavage is characteristic of telolecithal and centrolecithal yolk, which contain too much eggs to be cleaved completely. 3./4. The gray cortex of the amphibian egg arises when the egg crescent rotates toward the sperm entry point. 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. 5. The onset of the midblastula transition is controlled by a. centrioles b. contractile rings c. localized cytoplasmic determinants d. none of the above is correct 6. The supply of M phase-promoting factor (MPF) controls a. the arrest of growing amphibian oocytes in prophase I of meiosis b. the arrest of mature amphibian oocytes in metaphase II of meiosis c. the mid-blastula transition in Drosophila d. all of the above are correct 7. Discoidal cleavage is characteristic of a. amphibians b. insects c. mammals d. none of the above is correct 8. 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 correct d. none of the above is correct 9. A compartment in insect epidermis is a. defined by clonal restriction lines b. filled with a polyclone c. both of the above are correct d. none of the above is correct
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10. Nuclei from frog kidney, upon transplantation into newt oocytes, support the synthesis of a. frog kidney-specific proteins b. frog oocyte-specific proteins c. newt kidney-specific proteins d. none of the above is correct 11. Dorsal vegetal blastomeres of frog embryos at the 32/64-cell stage will form a. the Nieuwkoop center b. the Spemann organizer c. both of the above are correct d. none of the above is correct FILL IN THE BLANKS Complete each of the following sentences by inserting one word into each blank space so that a scientifically and linguistically correct statement results. A hyphenated word counts as one word. 12./13. The midblastula transition (MBT) is thought to be triggered when embryonic cells reach a certain _______________ ratio. In accord with this hypothesis, MBT occurs one cell cycle _______________ than normal if half of the egg cytoplasm is removed after fertilization. 14./15. The phenomenon of transdetermination was first observed in Drosophila _______________ discs that had been forced through many extra rounds of cell _______________.
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BIO 349 sample exam summer 97 - BIO 349 Developmental...

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