SI Bio 211 Practice Exam III Part II10.31.0721. In the hydrologic (water) cycle how does most water leave plants?a. Through the rootsb. When animals eat the plantsc. When plants die, water escapes directly to the soil.d. transpiratione. When plants die, water is transferred to the detritivors.22. Why does the excess nitrogen and phosphorus in farm runoff often kill the fish in nearby lakes?a. Fish are poisoned by low amounts of nitrogen and phosphorus fertilizers.b. Dead plant life causes an over stimulation of detritivores which consume all the oxygen in the water.c. The stimulated plant life near the bottom withdraws nutrients from the rest of the ecosystem.d. An improper balance of N, C, and P is created.e. Choices a, b, c, and d are all correct.23. What is the meaning of the term interphase?a. The time between rounds of DNA synthesisb. The time between one mitosis and the nextc. G1 phase + S phase + G2 phased. The pause between prophase and anaphasee. Choices b and c are both correct.24. When during the mitotic cell cycle are the number of chromosomes and chromatids the same?a. prophaseb. G2c. G1 d. metaphasee. both b and d are correct25. What defines the beginning of prophase?a. The separation of sister chromatidsb. The synthesis of DNAc. The appearance of visible chromosomes d. The formation of the spindlee. The formation of the nuclear membrane26. When during the cell cycle does the nuclear membrane form?a. S phaseb. G2 phasec. anaphased. telophase e. prophase27. Which of the following statements about the relationship between DNA molecules and chromatids is correct?a. Each chromatid contains a single linear DNA molecule.b. Each chromatid contains a large number of circular DNA molecules.c. The number of DNA molecules per chromatid varies between one and two depending on the time in the cell cycle.d. The number of DNA molecules per chromatid is described by the term ploidy. Thus, diploid cellscontain two, tetraploid four, etc.e. Each gene is a DNA molecule, and chromosomes contain many genes, therefore each chromatid contains a large number of linear DNA molecules.1SI Bio 211 Practice Exam III Part II10.31.0728. Which of the following terms refers to structures with similar, but not identical, DNA molecules?a. diploidsb. homologous chromosomesc. sister chromatidsd. homologse. choices b and d are both correct29. How many chromosomes and how many chromatids are present in a haploid cell during metaphase if a diploid cell from the organism has 48 chromosomes during G1?a) 24 and 24; b) 24 and 48; c) 48 and 48; d) 48 and 96; e) 96 and 96. 30. Which of the following statements about meiosis is correct?a. One purpose of meiosis is to assure that sexual reproduction does not double the amount of DNA per cell each generation.b. One purpose of meiosis is to assure that daughter cells are essentially identical.c. One purpose of meiosis is to provide a large amount of variation within a population.d. Choices a and c are both correct.e. Choices a, b, and c are all correct.31. What is a major difference between Prophase of Meiosis I and Prophase of Meiosis II?a. DNA synthesis occurs in Prophase I, but not in Prophase II.b. Recombination occurs in Prophase I, but not in Prophase II.c. The spindle forms in Prophase II, but not Prophase I.d. Chromosomes line up in the center of the cell in Prophase I. Chromosomes do not line up in Prophase II.e. Choices b and c are both correct.32. A diploid brain cell from a female mouse has 22 chromosomes in Metaphase. How many chromosomes and how many chromatids are present in prophase of meiosis II in this mouse?a. 11 chromosomes and 11 chromatidsb. 11 chromosomes and 22 chromatidsc. 22 chromosomes and 11 chromatidsd. 22 chromosomes and 22 chromatidse. 22 chromosomes and 44 chromatids33. A Drosophila melanogaster sperm cell has four chromosomes. How many DNA molecules, how many chromatids, and how many chromosomes are present in a Drosophila cell nucleus during metaphase of Meiosis I?a. 4 DNA Molecules, 4 chromatids, and 4 chromosomesb. 8 DNA Molecules, 8 chromatids, and 4 chromosomesc. 8 DNA Molecules, 8 chromatids, and 8 chromosomesd. 16 DNA Molecules, 8 chromatids, and 8 chromosomese. 16 DNA Molecules, 16 chromatids, and 8 chromosomes 34. A tetraploid marigold cell has 48 chromosomes in its nucleus during the G1 portion of the mitotic cell cycle. How many chromosomes are present in a cell from the same plant which is in the metaphase of meiosis II?a. 96b. 48c. 24d. 12e. 62SI Bio 211 Practice Exam III Part II10.31.07ANSWERS1. B2. D3. C4. A5. D6. D7. D8. C9. E10. A11. C12. E13. C14. C15. A16. A17. B18. E19. E20. B21. D22. B23. E24. C25. C26. D27. A28. B29. A30. D31. B32. B33. E34.
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