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The Cell Cycle Practice Test 2009

The Cell Cycle Practice Test 2009 - The Cell Cycle Practice...

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The Cell Cycle Practice Test 2009-10 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. Answer: A 2) What is a chromatid? 3) What is the name for the special region on a duplicated chromosome that holds the sister chromatids together? 4) Starting with a fertilized egg (zygote), a series of five cell divisions would produce an early embryo with how many cells? REMEMBER the first cell has to divide to make 2 new cells, that is the first division!!!! A) 4 B) 8 C) 16 D) 32 E) 64 Answer: D 5) If there are 20 chromosome arranged into 10 chromatid sets in a cell, how many centromeres are there? 6) Which of the following statements is not true? A) Mitosis produces new nuclei with exactly the same amount of DNA as the parent nucleus. B) Mitosis may occur before cytokinesis. C) Mitosis and cytokinesis are required for reproduction of non sex cells.
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D) All cells come from a preexisting cell. E) prokaryotes under go mitosis. Answer: E 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 different pairs of homologous chromosomes, one long and the other short. The chromosomes in the unlettered circle have not yet replicated because the cell is in G1 when this image was taken. Choose the correct chromosomal conditions for the following stages. Figure 12.1 7) one daughter nucleus at telophase of mitosis 8) one daughter cell at prophase B The questions below refer to the following terms. Each term may be used once, more than once, or not at all. 9) Two centrosomes are arranged at opposite poles of the cell. Answer: C 10) Centrioles begin to move apart in animal cells. Answer: E 11) This is the longest of the mitotic stages. Answer: D 12) Centromeres uncouple, sister chromatids are separated, and the two new chromosomes move to opposite poles of the cell. Answer: B
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