Ch12 Test Bank - Ch12 Cell Cycle Multiple Choice Identify...

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Ch12 Cell Cycle 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. ____ 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? b. centromere ____ 4. Starting with a fertilized egg (zygote), a series of five cell divisions would produce an early embryo with how many cells? d. 32 __ B __ 5. If there are 20 chromatids in a cell, how many centromeres are there? b. 20 ____ 6. Which of the following statements is not true? e. The mitotic spindles in prokaryotic cells are composed of microtubules. 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.
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____ 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. e. E ____ 10. Centrioles begin to move apart in animal cells. e. E ____ 11. This is the longest of the mitotic stages. e. E ____ 12. Centromeres uncouple, sister chromatids are separated, and the two new chromosomes move to opposite poles of the cell.
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b. B ____ 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. anaphase ____ 14. A cell containing 92 chromatids at metaphase of mitosis would, at its completion, produce two nuclei containing how many chromosomes? d. 46 ____ 15. If the cell, whose nuclear material is shown in the figure below, continues toward completion of mitosis, which of the following events would occur next? d. formation of telophase nuclei ____ 16. All of the following occur during prophase of mitosis in animal cells except d. chromosomes are duplicated. ____ 17. If there are 20 centromeres in a cell at anaphase, how many chromosomes are there in each daughter cell following cytokinesis? a.
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This note was uploaded on 11/16/2009 for the course SCIENCE 2412432 taught by Professor Burns during the Winter '04 term at American University of Science & Tech.

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Ch12 Test Bank - Ch12 Cell Cycle Multiple Choice Identify...

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