A.P._Chapter_12_13_Web_Test - A.P. Biology: Chapter 12...

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1. The centromere is a region in which a. chromatids are attached to one another. b. metaphase chromosomes become aligned. c. chromosomes are grouped during telophase. d. the nucleus is located prior to mitosis. e. new spindle microtubules form. 2. If there are 20 chromatids in a cell, how many centromeres are there? a. 10 b. 20 c. 30 d. 40 e. 80 Use the following information to answer the questions below. The lettered circle in the figure below shows a diploid nucleus with four chromosomes. There are two pairs of homologous chromosomes, one long and the other short. One haploid set is symbolized as black and the other haploid set is gray. The chromosomes in the unlettered circle have not yet replicated. Choose the correct chromosomal conditions for the following stages. 3. at prometaphase of mitosis a. A b. B c. C d. D e. E 4. one daughter nucleus at telophase of mitosis a. A b. B c. C d. D e. E
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The questions below refer to the following terms. Each term may be used once, more than once, or not at all. A. telophase B. anaphase C. prometaphase D. metaphase E. prophase 5. Two centrosomes are arranged at opposite poles of the cell. a. A b. B c. C d. D e. E 6. Centrioles begin to move apart in animal cells. a. A b. B c. C d. D e. E 7. This is the longest of the mitotic stages. a. A b. B c. C d. D e. E 8. Centromeres uncouple, sister chromatids are separated, and the two new chromosomes move to opposite poles of the cell. a. A b. B c. C d. D e. E 9. All of the following occur during prophase of mitosis in animal cells except a. the centrioles move toward opposite poles. b. the nucleolus can no longer be seen. c. the nuclear envelope disappears. d. chromosomes are duplicated. e. the spindle is organized. Use the data in the table below to answer the following questions. The data were obtained from a study of the length of time spent in each phase of the cell cycle by cells of three eukaryotic organisms designated beta, delta, and gamma. Minutes Spent in Cell Cycle Phases Cell Type S M
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Beta 18 24 12 16 Delta 100 0 0 0 Gamma 18 48 14 20 10. Of the following, the best conclusion concerning the difference between the S phases for beta and gamma is that a. gamma contains more DNA than beta. b. beta and gamma contain the same amount of DNA. c. beta contains more RNA than gamma. d. gamma contains 48 times more DNA and RNA than beta. e. beta is a plant cell and gamma is an animal cell. 11. Where do the microtubules of the spindle originate during mitosis in both plant and animal cells? a. centromere b. centrosome c. centriole d. chromatid e. kinetochore 12. Cytokinesis usually, but not always, follows mitosis. If a cell completed mitosis but not cytokinesis, the result would be a cell with a. a single large nucleus. b.
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A.P._Chapter_12_13_Web_Test - A.P. Biology: Chapter 12...

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