In which group of eukaryotic organisms does the nuclear envelope remain intact during mitosis?
A) seedless plants
B) dinoflagellates
C) diatoms
D) dinoflagellates and diatoms only
E) seedless plants, dinoflagellates, and diatoms
Answer: D
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Biology
- Several organisms, primarily protists, have what are called intermediate mitotic organization. These protists are intermediate in what sense?
- MPF reaches its threshold concentration at the end of this stage.
- At which of the numbered regions would you expect to find cells at metaphase?
- What is the correct chromosomal condition for one daughter nucleus at telophase of mitosis?
- You have a series of cells, all of which were derived from tumors, and you first need to find out which ones are malignant. What could you do?
- For a chemotherapeutic drug to be useful for treating cancer cells, which of the following is most desirable?
- A research team began a study of a cultured cell line. Their preliminary observations showed them that the cell line did not exhibit either density-dependent inhibition or anchorage dependence. What could they conclude right away?
- What explains anchorage dependence of animal cells in vitro or in vivo?
- At the M phase checkpoint, the complex allows for what to occur?
- All cell cycle checkpoints are similar in which way?
- Which of the following most accurately describes a cyclin?
- Why do neurons and some other specialized cells divide infrequently?
- After which checkpoint is the cell first committed to continue the cell cycle through M?
- Besides the ability of some cancer cells to overproliferate, what else could logically result in a tumor?
- Cells from an advanced malignant tumor most often have very abnormal chromosomes, and often an abnormal total number of chromosomes. Why might this occur?
- A particular cyclin called cyclin E forms a complex with Cdk 2 (cyclin-dependent kinase 2). This complex is important for the progression of the cell from G1 into the S phase of the cell cycle. Which of the following statements is correct?
- Which of the following describe(s) cyclin-dependent kinase (Cdk)?
- Which of the following is true concerning cancer cells?
- Density-dependent inhibition is explained by which of the following?
- A mutation results in a cell that no longer produces a normal protein kinase for the M phase checkpoint. Which of the following would likely be the immediate result of this mutation?
- The MPF protein complex turns itself off by
- Proteins that are involved in the regulation of the cell cycle, and that show fluctuations in concentration during the cell cycle, are called
- The cyclin component of MPF is destroyed toward the end of which phase?
- Which of the following triggers the cell's passage past the G2 checkpoint into mitosis?
- Which of the following is a protein maintained at constant levels throughout the cell cycle that requires cyclin to become catalytically active?
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