Chapter 12 Questions-1

Chapter 12 Questions-1 - Ch 12 Multiple Choice Identify the...

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Ch 12 Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. ____ 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. What is a chromatid? a. a chromosome in G 1 of the cell cycle b. a replicated chromosome c. a chromosome found outside the nucleus d. a special region that holds two centromeres together e. another name for the chromosomes found in genetics ____ 3. What is the name for the special region on a duplicated chromosome that holds the sister chromatids together? a. centrosome b. centromere c. kinetochore d. desmosome e. microtubule organizer region ____ 4. Starting with a fertilized egg (zygote), a series of five cell divisions would produce an early embryo with how many cells? a. 4 b. 8 c. 16 d. 32 e. 64 ____ 5. If there are 20 chromatids in a cell, how many centromeres are there? a. 10 b. 20 c. 30 d. 40 e. 80 ____ 6. Which of the following statements is not true? a. Mitosis produces new nuclei with exactly the same chromosomal endowment as the parent nucleus. b. Mitosis may occur without cytokinesis. c. Mitosis and cytokinesis are required for asexual reproduction. d. All cells come from a preexisting cell. e. The mitotic spindles in prokaryotic cells are composed of microtubules. Use the following information to answer the questions below.
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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. ____ 7. at prometaphase of mitosis a. A b. B c. C d. D e. E ____ 8. one daughter nucleus at telophase of mitosis a. A b. B c. C d. D e. E 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 ____ 9. Two centrosomes are arranged at opposite poles of the cell. a. A b. B
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c. C d. D e. E ____ 10. Centrioles begin to move apart in animal cells. a. A b. B c. C d. D e. E ____ 11. This is the longest of the mitotic stages. a. A b. B c. C d. D e. E ____ 12. 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 ____ 13. If cells in the process of dividing are subjected to colchicine, a drug that interferes with the functioning of the spindle apparatus, at which stage will mitosis be arrested? a.
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This note was uploaded on 12/13/2010 for the course ACT 101 taught by Professor Jenkins during the Spring '10 term at Alabama State University.

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Chapter 12 Questions-1 - Ch 12 Multiple Choice Identify the...

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