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Unformatted text preview: BIO 349 Developmental Biology (K. Kalthoff) Exams Fall 1997 First Midterm Exam (2 October 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. Centrolecithal cleavage is characteristic of telolecithal and meroblastic eggs, which often contain too much yolk to be cleaved completely. 3/4. Cytoplasmic transplantation and cell fusion experiments show that gene expression is controlled by the nuclear environment. 5/6. The marginal cells play a role in the initial phase of amphibian gastrulation whereas later gastrulation is driven by the involution of bottle zone cells. 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 correct. 7. Imaginal discs normally occur in a. adult insects b. amphibian neural plates c. insect larvae d. mammalian embryos 8. Cell determination - or the lack thereof - may be analyzed by a. cell isolation b. cell transplantation c. clonal analysis d. all of the above 9. The activity of a localized cytoplasmic determinant can be proven by a. the unequal distribution of a visible cytoplasmic component b. local UV irradiation c. both of the above are correct d. none of the above is correct 10. Which of the following regions of a Xenopus gastrula contribute to the archenteron a. bottle cells b. superficial layer of the involuting marginal zone 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. 11/12.During holoblastic cleavage, the plane of _______________ forms perpendicular to the axis of the _______________ spindle. 13/14._______________ chromosomes originate by several rounds of chromosome _______________ without subsequent mitosis. 15/16.According to the principle of _______________ programs, cells that fail to receive a cytoplasmic determinant proceed with a developmental program that is normally carried out _______________ in the embryo. 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 out the one odd statement, be it correct or false, and circle the respective letter. 17. Determined State of Amphibian Cells a. Pregastrula dorsal animal cells are determined to form neural plate....
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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.
- Fall '09
- Developmental Biology