Exam 12: Mitosis

Amount of DNA per nucleus over the cell division cycle. At which point in the accompanying figure does MPF reach its highest activity during the cell division cycle?

A research team used a culture of lymphocytes with radioactively labeled T nucleotides to study the cell cycle. They found that the lymphocytes incorporated the labeled nucleotide at a significantly higher rate after a pathogen was introduced into the culture. Which of the following conclusions is most consistent with the results?

The decline of MPF activity at the end of mitosis is due to ________.

Use the figure to answer the question below. If the cell whose nuclear material is shown in the accompanying figure continues toward completion of mitosis, which of the following events would occur next?

If there are 24 centromeres in a cell at anaphase of mitosis, how many chromosomes will be found in each daughter cell following cytokinesis?

The mass of DNA per nucleus in a certain fungus ranges from 4 to 10 picograms. Nuclei with 5 picograms of DNA are most likely derived from cells in which of the following parts of the cell cycle?

Besides the ability of some cancer cells to over proliferate, which of the following situations is most likely to result in a tumor?

Cell A has half as much DNA as cells B, C, and D in a mitotically active tissue. Cell A is most likely in ________.

Which of the following statements best explains how neurons and some other specialized cells divide infrequently?

Taxol is an anticancer drug extracted from the Pacific yew tree. In animal cells, Taxol prevents microtubule depolymerization, which interferes with which of the following processes?

The unlettered circle at the top of the accompanying figure shows a diploid nucleus with four chromosomes that have not yet replicated. The circles labeled 1 to 5 show various combinations of these chromosomes. Which chromosomal configuration would be observed in one daughter cell after telophase of mitosis?

Which of the following occurs during S phase?

In which phase of mitosis do the sister chromatids become daughter chromosomes?

What is the name of the region on duplicated chromosomes where the sister chromatids are most closely attached to each other?

Which of the following molecules is maintained at a relatively constant level throughout the cell cycle but requires a cyclin to become catalytically active?

Certain unicellular eukaryotes, including diatoms and some yeasts, have mechanisms of nuclear division that resemble intermediate steps in the evolution of mitosis. Which of the following is a characteristic feature of nuclear division in these organisms?

Eukaryotic chromatin is composed of which of the following macromolecules?

Which of the following statements best describes how cytokinesis differs between plant and animal cells?

Which of the following cellular events occur in the G1 phase of the cell division cycle?

At which phase of the cell cycle do centrioles begin to move apart in animal cells?