E55-2009 practice exam 1

When sperm are added the following will occur a

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When sperm are added, the following will occur: A. fertilization with only 1 sperm, such that polyspermy is blocked B. fertilization will fail C. fertilization can occur, but polyspermy will be possible D. the majority of eggs will be subject to polyspermy 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?
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When sperm are added the following will occur A...

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