12_TestBank_TB - Biology, 7e (Campbell) Chapter 12: The...

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Biology, 7e (Campbell) Chapter 12: The Cell Cycle Chapter Questions 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 1
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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. 2
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Use the following information to answer the questions below. The lettered circle in Figure 12.1 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. Figure 12.1 7) at prometaphase of mitosis 8) one daughter nucleus at telophase of mitosis 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. 10) Centrioles begin to move apart in animal cells. 11) This is the longest of the mitotic stages. 12) Centromeres uncouple, sister chromatids are separated, and the two new chromosomes move to opposite poles of the cell. 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 B) prophase C) telophase 3
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D) metaphase E) interphase 14) A cell containing 92 chromatids at metaphase of mitosis would, at its completion, produce two nuclei containing how many chromosomes? A) 12
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12_TestBank_TB - Biology, 7e (Campbell) Chapter 12: The...

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