bio 349 sample exam 1994

bio 349 sample exam 1994 - BIO 349 Developmental Biology...

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BIO 349 Developmental Biology (K. Kalthoff) Exams Summer 1994 First Midterm Exam (15 June 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. Centrolecithal cleavage is characteristic of telolecithal and meroblastic eggs, which often contain too much yolk to be cleaved completely. 3/4. Embryonic determination is an interaction between one (inducing) tissue and another (responding) tissue, as a result of which the responding tissue changes its state of induction. 5/6. The first part of sea urchin gastrulation is caused by forces developed within the mesenchymal plate, whereas the last part involves the pulling action of secondary vegetal 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 the most adequate. 7. Genetic totipotency, or at least pluripotency, has been demonstrated in: a. frog and sea urchin blastomeres b. nuclei from differentiated frog cells c. differentiated plant cells d. all of the above are correct 8. 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 9. Imaginal discs are found in a. adult insects b. insect larvae c. mammalian embryos d. salamander lenses 10. Anterior determinants in dipteran embryos are thought to be a. microtubules b. mitochondria c. pigment granules d. ribonucleoprotein (RNP) particles 11. The capacitation of mammalian sperm
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a. involves changes in the sperm head b. occurs in the uterus or oviduct c. both of the above are correct d. none of the above is correct 12. Which two membranes fuse during the cortical reaction? a. acrosomal membrane with sperm plasma membrane b. sperm plasma membrane with egg plasma membrane c. both of the above are correct d. none of the above is correct 13. A male germ line cell after the second meiosis is called a a. spermatid b. spermatozoan c. both of the above may apply d. none of the above is correct 14. Nurse cells in the egg chambers of insects are a. diploid b. haploid c. both of the above are correct d. none of the above is correct 15. 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 16. Localization of cytoplasmic determinants may occur a. during oogenesis b. upon fertilization c. during cleavage d. all of the above are correct 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. Cell Determination and Differentiation
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bio 349 sample exam 1994 - BIO 349 Developmental Biology...

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