12 - A.P. Biology: Chapter 12 & 13 Test 1. The centromere...

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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.
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This note was uploaded on 02/10/2011 for the course BIO 101 taught by Professor Thoma during the Spring '08 term at University of Wisconsin Colleges Online.

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12 - A.P. Biology: Chapter 12 & 13 Test 1. The centromere...

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