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E55-2009 practice exam 1

The majority of eggs will prematurely enter mitosis 9

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E. the majority of eggs will prematurely enter mitosis ______9. Cellular diversification, or the process by which cells become structurally and functionally distinct, is known as: A. specification B. determination C. differentiation D. both A and C E. both A and B ______10. Which of the following does not occur in the process of mammalian gametogenesis: A. meiosis B. germ cell maturation without external influences C. specialization of cellular architecture D. germ cell maturation outside the gonad E. none of the above ______11. Studying genomic DNA is useful because A. it contains the regulatory DNA that affects expression of a gene B. it lacks introns, which complicate studying genes C. it lacks exons, which complicate studying genes D. it reflects the kinds and abundance of mRNAs in a tissue sample E. it reflects the abundance of proteins in a tissue sample ______12. Meiosis is a process that: A. results in identical daughter cells B. results in non-identical daughter cells due to reductive division C. results in non-identical daughter cells due to recombination D. both B and C E. none of the above ______13. The acrosome serves as a main storage site for ______, and is derived from_____. A. metabolic proteins, ER B. translational machinery, cytoplasm C. proteases, Golgi apparatus D. digestive enzymes, ER E. transcripts, nuclear membrane ______14. The molecule that is largely responsible for the fast block to polyspermy is: A. calcium B. phosphate C. bindin D. sodium E. resact
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E-55, Exam 1-2009: Name Page 4 of 9 ______15. A recessive zygotic mutation is best characterized by which of the following? A. It results in phenotypes only when the maternal parent is homozygote regardless of the paternal genotype. B. It results in phenotypes only when the paternal parent is homozygote regardless of the maternal genotype. C. It results in phenotypes only when the offspring have one mutant and one wild- type copy of the gene. D. It results in phenotypes only when the offspring have one mutant and one wild- type copy of the gene, and the maternal parent was homozygous mutant. E. It results in phenotypes only when the offspring possess two mutant gene copies. ______16. The polymerase chain reaction is useful because: A. it can be used to measure protein levels in a cell population B. it can be used to study protein modifications from kinases during the cell cycle C. it can be used to amplify specific cDNA sequences for analysis of transcription D. it can be used to visualize distribution of transcripts in a tissue section E. none of the above ______17. Sea urchin eggs are pretreated with an excess of purified bindin protein, then incubated with sperm of the same species. Which of the following will most likely occur? A. sperm will be hyperactivated B. polyspermy C. fertilization D. fertilization will fail E. egg activation ______18. You wish to isolate proteins that are important for sperm-egg membrane binding during vertebrate development. This type of approach requires a large amount of egg or sperm samples. Which of the following models would be the best to use? A. the fly, Drosophila melanogaster B. the zebrafish, Danio rerio C. the worm, Caenorhabitis elegans D. the sea urchin, Stronglycentrotus purpuratus E. none of the above ______19. The presumptive hematopoietic mesoderm is located at the ventral margin of a frog blastula. When this blastula-stage tissue is placed into a kidney-forming region of a host frog embryo, it contributes to the embryonic kidney. Based just on this information
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