Biology+Study+Guide+2 - Biology Study Guide 2 1 The...

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Biology Study Guide 2 1) The centromere is a region in which 1) _______ A) new spindle microtubules form. B) metaphase chromosomes become aligned. C) chromatids are attached to one another. D) chromosomes are grouped during telophase. E) the nucleus is located prior to mitosis. 2) What is a chromatid? 2) _______ 3) Starting with a fertilized egg (zygote), a series of five cell divisions would produce an early embryo with how many cells? 3) _______ 4) If there are 20 chromatids in a cell, how many centromeres are there? 4) _______ 5) Which of the following statements is not true? 5) _______ A) Mitosis may occur without cytokinesis. B) All cells come from a preexisting cell. C) Mitosis produces new nuclei with exactly the same chromosomal endowment as the parent nucleus. D) The mitotic spindles in prokaryotic cells are composed of microtubules. E) Mitosis and cytokinesis are required for asexual reproduction. 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 6) Two centrosomes are arranged at opposite poles of the cell. C. prometaphase 6) _____________ 7) Centrioles begin to move apart in animal cells. E. prophase 7) _____________ 8) Centromeres uncouple, sister chromatids are separated, and the two new chromosomes move to opposite poles of the cell. B. anaphase 8) _____________ 9) 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? 9) _______
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10) A cell containing 92 chromatids at metaphase of mitosis would, at its completion, produce two nuclei containing how many chromosomes? 10) ______ 11) If there are 20 centromeres in a cell at anaphase, how many chromosomes are there in each daughter cell following cytokinesis? 11) ______ 12) If there are 20 chromatids in a cell at metaphase, how many chromosomes are there in each daughter cell following cytokinesis? 12) ______ A) 30 B) 80 C) 20 D) 10 E) 40 13) Where do the microtubules of the spindle originate during mitosis in both plant and animal cells? 13) ______
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