koofer - Biology 1107 Exrim IV 03-28-08 BARSTOW The...

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Biology 1107 Exrim IV 03-28-08 BARSTOW The lettered circle in the figure below shows a Airtoid nucleus with four chromosomes. There-are two pairs of homologo.r, "iro^osomes, one long and the other shorf. One haploid set is ' I 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. "'S ua-olq."s L1\toaote"9 :l fi {: ,iosist{}t) 1) Chromosomal configuration typical of mr 2) A daughter nucleus at telophase of meiosis I 3) Througb a microscope, you can see a cell plate beginning to devdlop across the middle of a cell and nuclei re-forming'on either side of the cell plate. This cell is most likely A) an animal cell in the S phase of the cell cycle. B) a bacterial cell dividing. -C) a plant cell in the process of cytokinesis. , ' D) a plant cell in metaphase. E) an animal cell in the prcicess of cytokinesis. 4) A particular cell has half as much DNA as some other cells in a mitotically active tissue. The cell in question is most likely in AG2, I ' ---BGl C prophase. D metaphase. E anaphase. " r 5) Which term describes cenhomeres uncoupling, sister chromatids separating, and the two new chromosomes moving to opposite poles of the cell? - A anaphase B telophase C prophase D metaphase E prometaphase
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Use the data in Table 12.1 to answer the following questions. The data were obtained from a study of the length of time spent in each phase of the cell cycle by cells of threb different eukaryotic organisms designated beta, delta, and gamri'ra. .. Cell Type G1 S GZ M Delta 100 0 '0 0 ' Gnmma 18 '48 11 20 Table 12.1: Minutes Spent in Cell Cycle Phases 6) Of the following, the best conclusion concerning the difference between the S phases for beta and gamma is that - A gamma contains more DNA than beta. Ebetacontains more RNA than gamma. pbeta and gamma contain the same amountbf DNA. 'D b.tu is a plant cell anh gamma is an animal cell.' E gamma contains 48 times more DNA and RNA than beta. 7) The best conclusion concerning delta is thdLt the cells A cohtain no DNA. ' u - B are actually in the G0 phase. ! C contain no RNA. or o D divide in the Gl phase: E contain only one chromosome that is very short. t-' 8) Taxol is an anticancer drug extracted from the Pacific yew tree. In animal cells, taxol disrupts microtubule formation by binding to microtubules and accelerating their assembly from the protein precursor, tubulin. Surprisingly, tliis stops.mitosis. Specifically, taxol must affect A formation of the centrioles. ' . B chromatid assembly.
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koofer - Biology 1107 Exrim IV 03-28-08 BARSTOW The...

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